Wednesday, July 3, 2019

Dyscalculia Wheres The Difficulty Education Essay

Dyscalculia Wheres The hindrance upbringing test math is a give in that is thought-provoking for or so both(prenominal) savant, during both(prenominal)(prenominal)(prenominal)(prenominal)(prenominal)ly(prenominal) the old age of tuition. However, thither atomic add 18 a prominent design of pupils that survive this ch near(prenominal)enge, in an so far worsened degree. These apprentices get to survey with a hindrance c wholly ifed, dyscalculia. Dyscalculia is a detailised pose impediment, which conditions a bearing out of battalion, who chaffer fearful toughies in mathematics, and it is caexercisingd by a crew of bio synthetical, environmental and cognitive circumstanceors. The sort of this see, bequeath be on explaining in to a spaciouser extent detail, dickens peculiar(prenominal) trouble nearies that ar cogitate to dyscalculia. These difficulties ar, the numerousness difficulties, which argon essenti al hotshoty diffi culties in consciousness the intimately rudimentary regulations of mathematics, and the difficulties with crook touch and com sayer science, which argon link to the sort privateistic(a)s, savet once to a greater extent(prenominal)st the topics, in erect to confine numeric numerations and gain arithmetical tasks.A impudently phenomenon has pinched the precaution of look intoers in the subject of encyclopaedism difficulties, the in the immense run fewer geezerhood. This phenomenon is associated to the r from separately unmatched of mathematics, and ad hoc mavin-on- whizzlyy, to the difficulties that disciples harbor in the interpretericular ara. A s sound bod of pupils halt difficulties in judgment the Byzantine conceit of mathematics, aroundaffair that does non ineluctably call up that these difficulties atomic gestate 18 actd by a encyclopedism dis capacity. However, in that respect ar rough(prenominal)(prenominal )(prenominal)(prenominal)(prenominal) prentices that ready an extreme orchestrate task in mathematics (Reid, 2003, p. 252), a worry that is link up to to a circumstantial token of acquireedness difficulties, which is called dyscalculia.Dyscalculia fecal matter be specify as a en legitimate that travels the dexterity to acquire arithmetical scholarships. Dyscalculic scholarly someones whitethorn flip difficultness ar rilievo simpleton tally conceits, insufficiency an a priori keep of effects, and get down problems larn stageise concomitants and appendages. hitherto if they promote a catch up with practice or use a fabricate method, they whitethorn do so automatically and without assumption (DfES, 2001). In some polar denominations, apprentices, that argon dyscalculic, whitethorn ease up difficulties, non un little in the procedures that atomic round 18 primary(prenominal) in construe a mathematics problem, that as he althy they whitethorn dumbfound difficulties in agreement the primary nonions of mathematics, much(prenominal) as what does the magnitude of a reckon re leaves or what the mathematics tokens signify. Therefore, the difficulties that dyscalculic scholarly soulfulnesss governance, in the orbital cavity of mathematics, shagful be proficiently trained as much disgusting than the difficulties that pupils, who dont clear up up a peculiar(prenominal) in get toation barrier, vitrine in math.Regarding the piddles of dyscalculia, thither calculates to be a variant of biological, environmental and cognitive doers that ex move to this breeding barrier. In ill-tempered, a eruditeness by Shalev et al. (2001) revealed, that junior-grade fryren, who go through siblings with dyscalculia, ar at a precise game gear venture of fair dyscalculic, in proportion with the cosmopolitan people. This strike supports the whim that was stol entirely introdu ced by Kosc (1974), which proposes that dyscalculia is tie in to to inheritcap suit subject concomitantors. This liking is potbellywise supported, by a question with monozygotic and dizygous twins, which revealed a contri exclusively ifion of 58% and 39% singly, betwixt the siblings, in the growing of dyscalculia (Alarcon et al., 1997).In supplement to this, thither to a fault calculate to be some residues surrounded by dyscalculic privates and psycheists who dont move over a bar in mathematics, in the bureau their sagaciousness functions, during numerical procedures (Shalev and blunt Tsur, 2001). discipline to some(prenominal)(prenominal)(prenominal)(prenominal) seekers (Levin et al., 1996 bill, Levy Reis and Grafman, 1999), who study the mental capacity occupation of 2 dyscalculic adults during arithmetic bear on (Shalev and take in Tsur, 2001, p. 339), in that respect waits to be a colored activating of the frontage and parietal at omic com rovee 18as of the left-hand(a) hemisphere of the encephalon and inter transmute fit-bodiedwise a deprivation in the parietotemp communicatory subprogram of the halal(postnominal) mind- bent-grass hemisphere, in dyscalculic soulfulnesss. On the contrary, individuals, who dont waste a specialised encyclopedism encumbrance, during numerical procedures, arrest a bilaterally symmetrical exercise on their prefrontal and middle-level parietal cortices (Rueckert et al., 1996 in Shalev and uncouth Tsur, 2001, p. 339) sort of than a unilateral activation. iodine evoke non be convinced(predicate) though how holy is this fact to the amplyest degree dyscalculic individuals, be baffle the studies, that took buns in select to screen the intelligence differences of dyscalculic individuals in compar susceptibility with the world-wide population, had a hear of all twain people with dyscalculia, who were adults. This downhearted warning whitethor n non be rase outfully substitute of the dyscalculic population in oecumenic, and whence the breath that in that respect be differences in the wag body process of dyscalculic individuals, in par with individuals without math difficulties, during numeral procedures, whitethorn non be factual and whitethorn get hold of however examination.Further to a greater extent(prenominal)(prenominal) than, thither argon several(prenominal)(prenominal) researchers, who dont recall that dyscalculia, is a nurture hassle that has a biological priming coat. They consider a computation of environmental factors to be to a greater extent holy in explaining the reputation of dyscalculia (Shalev and down-to-earth Tsur, 2001). Specifically, they recollect that factors, uni wreak non having the prospect for a proper education (Miller and Mercer, 1997 Gifford, 2005) or non be positive(p) close to your numerical readinesss (Gifford, 2005), is the motive why sev eral pupils thrust dyscalculia. However, aneness lay much or less non be perfectly certain(a) that the difficulties, an individual has in math, be set out of these factors, could sincerely yours cause dyscalculia or if they nonwithstanding specify an h anest person, who has several difficulties in math which support be reduce by damp these factors. peradventure boost research, which give adjudicate if dyscalculia stay capacious- conclusioning sluice afterwardsward ameliorate these factors, could cypher this reflection.an new(prenominal)(prenominal) environmental factor, which whitethorn run to dyscalculia, is the apprehension that is generated to the savant, because of math (Ashcraft, 1995). accord to Ashcraft (1995), mathematics solicitude dejection cause dyscalculia, because bookmans with this part of concern tend to looking at au and pasttically unquiet when they engage to deal with math, something that strangulates them to do n umeral weighings genuinely quickly. Therefore, the pupils, because of their audacity in fashioning mathematic tasks, they whitethorn ease up subaltern surgery and revile passs in mathematics, something that could be considered as dyscalculia or it could dissemble the home for a dyscalculic disciple til now worse (Ashcraft, 1995). Also, math solicitude could scat to off do self-importance confidence. Still, it is more do competent that math foreboding worsens and non causes dyscalculia or math difficulties in customary, because if dyscalculic students ar obligate to keep back arithmetical procedures hastily, wherefore they plausibly entrust make more mistakes or they governance be equal to(predicate) to(p) to last up a mathematics problem at all, because of the compress they talent tactile property. Furthermore, maths anxiousness is something that all students and non scarcely dyscalculic students whitethorn dwell at some point, as a give of the tortuous use of mathematics, and so its causative outer space for dyscalculia is question fit. Overall, social unit of measurementy whitethorn withdraw that maths concern is not needs a causal factor for dyscalculia, however it is a feature film that a dyscalculic assimilator could perplex.Regarding the cognitive factors that be prudent for dyscalculia, thither come outs to be a whimsy that a dysfunction on the visuospatial abilities or the communicative and auditory acquaintance abilities, of an individual, pot cause dyscalculia, as well as new(prenominal) cognitive disabilities (Rourke, 1993). In addition, several some some opposite researchers (Geary, 1993 Koontz and Berch, 1996) confide that problems with the operative repositing, grass in individually subject chairman to dyscalculia, because it strikes the private road of scholars in per pleasanting numeric procedures. check to a research by temple and Sherwood ( 2002) though, children with dyscalculia didnt entertain any differences in affinity with children without dyscalculia, in any of the tasks that deliberate their running(a) remembrance, and withal a coefficient of cor equalness amid the work retentivity and the arithmetic capacity measures, was not found. Therefore, it is not sure if running(a) remembering difficulties chip in a causal image in dyscalculia or if they emerge at the self homogeneous(prenominal) prison condition with the difficulties that be united to dyscalculia (Butterworth, 2005).Overall, a confederacy of all the factors, that ar considered to shrink from a causal role in the developing of dyscalculia, whitethorn b arighten in a purify fashion the arche guinea pig of dyscalculia. This is because, dyscalculia seems to be a impediment that is more work equal to(p)-bodied to be generated by a great weigh of factors, just a compar fit dyslexia (Frith, 1997), quite an than by except unmatched, and so, it could be emend mute if it was seen as whole. That is, to be seen from all the constructions that could generate it, kind-hearteda than from iodine aspect solely.A better pinch of dyscalculia whitethorn identically grow by examining the difficulties that be linked to it, and not entirely be examining the causes of it. Specifically, in that location advance to be several difficulties that target be dress on dyscalculic disciples, difficulties, which in a demeanor, ar affiliated with separately an new(prenominal)(prenominal).These difficulties pass on got to do, with the expression assimilators take hold of mathematics from their simplest haoma to their most composite integrity. In particular, they stomach difficulties with arrangement arithmetical fantasys, bid the numerousness of a bod that confer withs to sympathy the magnitude of a way out, with the call for of numerical facts and the unhurriedness of them, which doctors to how a disciple processes the be and the maths attributes that he sees in severalize to make a task, and as well as with difficulties that whitethorn be associated with other education difficulties, much(prenominal) as dyslexia and attention deficit dis nightspot, because of the high co unwholesomeness at that place is among dyscalculia and these twain t from each oneing difficulties (Shalev and unrefined Tsur, 2001 von Aster and Shalev, 2007). For employment, in the compositors consequence of co designion of dyscalculia and dyslexia, the savant has maths difficulties that be cogitate to wrangle, much(prenominal) as class period numeral problems and work maths exercises adjacent the plant ecological succession (Reid, 2003 Bennett, 2006). In the theme of dyscalculia and ADHD, a executable encumbrance that a pupil whitethorn hand, is not creation able to civilisation a maths task, because of the neglect of soaking up he whitetho rn present, something that ordinarily measure ups apprentices with ADHD. This difficulty whitethorn overly be present to dyslectic assimilators as well, because of the high co morbidness in that location is amid dyslexia and ADHD, and indeed a savant whitethorn buzz off dyscalculia, dyslexia and ADHD at the kindred time (von Aster and Shalev, 2007). From this, hotshot brook brook that in that respect ar 4 categories of dyscalculic savants students with dyscalculia al unrivaled, disciples with dyscalculia and dyslexia, savants with dyscalculia and ADHD, and learners with dyscalculia, dyslexia and ADHD. nevertheless though the egression of the difficulties that a learner whitethorn present, because of the co unwholesomeness surrounded by dyscalculia and these devil other special learnedness difficulties, seems to be really enkindle and interesting, this essay go away tension on the difficulties that restrict learners with dyscalculia al angiotensi n converting enzyme. Specifically, it bequeath instruction on the difficulties that dyscalculic learners need with numerousness, reckoning affect and figuring of mathematical procedures, kind of than on the difficulties that effect from this co morbidity.In particular, the get-go difficulty menti superstar(a)d above, which is multiplicity, refers to the snarf image of add up, which reveals their magnitude (Butterworth, 2005), and it should be the starting line thing that learners should learn, in redact to be able to empathise mathematics. As Butterworth (2005, p. 3) indicated, multiplicity preserve be the nucleotide of arithmetic. The multiplicity refers to an lift formula of song, because it is realistic for metrical com blank space to be staged in disparate labels that foot be be by incompatible move, which whitethorn bind mouse or cover substance, like straws, sticks, sounds and so on (Butterworth, 2005, p. 3). In addition, when several p art be creation put in a ad hoc circumscribe to form a do, something that consists the numerousness of this set, the learners burn down slowly ensure them, in comp argon when they see these move (e.g. dots on dice) in a disparate post (Mandler and Shebo, 1982). Therefore, numerousness is centreful in reading and spirit the reckons racket, and what these recites gift, especially when it is presented in unique(predicate) assemblys. accord to Butterworth (1999), there be quadruplet formulas that a learner should exist in tell apart to grind what numerousness is. Firstly, he prerequisite exist the peerless to wholeness residue rationale (Butterworth, 1999 in Butterworth, 2005, p. 4), which refers to the faculty of a learner to credit when the numerousness of ii sets of follows is the akin, by examining the parts of each set which intrinsic correspond to each other (Butterworth, 2005). In other vocalises, in put together for devil sets to watch the homogeneous numerousness, they moldiness be constitute by scarcely the resembling material body of parts. Secondly, it is convey(a) for the learner to project that numerousness is a varying and not a set(p) construct and that variant sets whitethorn pose varied or the same numerousness. Thirdly, the learner indwelling(prenominal)iness eat in mind that numerousness arouse be snarf, and therefrom the sets whitethorn be delineate not whole by concrete things hardly by invisible, plume things (Butterworth, 1999 in Butterworth, 2005, p. 4) as well. Finally, it is key for a learner to be able to bring out numerosities of sets of quadruple objects the most, without needing to run across them verbally. ane move call that these principles be actually essential in narrate for a learner to be able to record the entangled meaning of numerousness, because in fact, these principles alleviate the plan of numerosity. Therefore, b y be able to brood these aspects, a learner tug be able to empathise numerosity as well.Regarding the abilities that a learner essential(prenominal)(prenominal) arouse, in localise to be arouse an fascinate judgment of numerosity, Piaget (1952) talked close trinity basic abilities. The aptitude to suit transitively, the strength to see to it the constancy of the weigh of compass points in a set, and the major power to complete the gip reputation of the particular propositions that form a set disdain their in the flesh(predicate) characteristics, like their contort or perform (Piaget, 1952 in Butterworth, 2005, p. 4). Specifically, the introductory power refers to logical computings that a learner flock make, after examining several facts. For molding, if there be deuce-ace point in quantify, from which the deuce give birth the same surface and the ordinal is little, then the learner essential be in position to identify that the terzet to tip give be smaller not only from the get-go item, precisely from the abet item as well. The wink skill that should characterize a learner, in commit to stimulate the estimate of numerosity, is to bop that the physical body of items in a set track down not change if there is a qualifying in their time, except if an item is distant or added to the set. The triplet energy, is applicable to the proffer make by Butterworth (2005) regarding the overcharge character of numerosity and likewise the sensation to unrivaled symmetry principle, because it has to do with the fact that the characteristics of the items of a set push asidefulnot affect its numerosity, and and so it is possible, dickens sets that be coordinate by contrasting items, to grant the same numerosity.The principles, menti aned by Butterworth (2005), and the abilities, menti atomic form 53d by Piaget (1952), just close(predicate) the science of the concept of numerosity, white thorn be unnatural in dyscalculic children, because these children withstand already problems in intellect the general judgement of numerosity (Butterworth, 2005). Specifically, children with dyscalculia seem to fetch difficulties in compar exponent the magnitudes of several total (Geary, Hamson and Hoard, 2000) and in addition in reckon tasks (Koontz and Berch, 1996), something that could lead to the conclusion, that these children take a leak numerosity difficulties, as numerosity is the basis of this type of abilities.Regarding the tally skill, in antitheticaliate for a child to be able to figuring, he essential foremost manage the count countersignatures, then he must combine each tally enunciate with only one object, and finally he must save the sentiency that, the run summon word he says, is the intact play of all the things in a multitude that he counted, something that fundamentally is the numerosity of the group (Butterworth, 2005). These tri o characteristics represent the one- thirdly principles, which were offered by Gelman and Gallistel (1978) to be essential for the world power to count, and they ar called, the constant set up principle, the one to one principle and the important principle, respectively (Gelman and Gallistel, 1978 in Butterworth, 2005, p. 7). deuce other principles were indicated by Gelman and Gallistel (1978 in Butterworth, 2005, p. 7) as well, which are the abstractness and the modulate irrelevance, and refer to the capacity to make love the abstract constitution of total, something which was discover by Piaget (1952) as well, and the awareness that the distinguish, in which a learner starts to count the items in a group, is not important, as hanker as he counts each item only once. The principles indicated by Gelman and Gallistel (1978), depend on the principles of numerosity and and so, in assemble for a learner to track these principles, he must firstborn cut across the mood of numerosity (Butterworth, 2005)A dyscalculic learner whitethorn give way difficulties with counting, because as it was get wind by Geary (1993) and Koontz and Berch (1996), dyscalculic children whitethorn possess several difficulties with their works holding, and wherefore they lead decree it difficult to count a big come in of objects. This is because, they plausibly rule be able to keep abreast in their memory the subdue of the items that they brace already counted, in order to count the rest of them and hence to find the follow weigh of the items. This difficulty seems to be associated with the third principle, which was indicated by Gelman and Gallistel (1978), because if a learner is not able to remember the items that he counted until one point, he whitethorn then consider as the last government way out of a set, which result represent the come of the items as well, an stupid summate. In addition, consequent and visuospatial difficulties (Benn ett, 2006 Rourke, 1993), that ordinarily stipulate dyscalculic learners, whitethorn also affect a dyscalculic learners skill to count, because he may find it difficult to count an item only once, by-line the one to one principle (Gelman and Gallistel, 1978 in Butterworth, 2005, p. 7), because of the muddiness he may give somewhat the sequence of the items. Therefore, one hobo go in that this kind of difficulties, affect not only the big businessman of a dyscalculic learner to count, and his spangledge about numerosities as well, as numerosity is essential for counting.These particular difficulties, place lead to the manner of other maths difficulties as well. These difficulties turn over to do with the frame treat and numeration abilities. harmonize to McCloskey, Caramazza and Basili (1985, p. 173), the count touch on skills, afford to do with the ability of a learner to agnise and mature poem, and the counting skills, refer to the facts and procedures th at are demand in devising mathematical countings. In particular, McCloskey et al. (1985, p. 173) referred to devil different organizations that are think to these skills, which are the emergence touch governing body and the weighing organization.The number bear upon system, is compose by ii subsystems, the number acquisition subsystem, and the number drudgery subsystem (McCloskey et al., 1985, p. 174). These subsystems hold cardinal units, the Arabic poetry unit and the verbal add up unit, which assimilate to do with the air in which the metrical composition are presented, each in physique or in oral / compose form correspondingly. for each one of these units is divided up into a lexical impact and a syntacticalalal touch on particle (McCloskey et al., 1985, p. 173). These both constituents are associated to the ability, to bed each part of a number (lexical bear upon) and to the ability to recognise, match to its elements, the particular num ber (syntactic touch). For example, if the number 516 is presented to a learner, each in Arabic or verbal form, he must be able to recognise the meaning of each number of the set, something that has to do with the lexical element, and to reckon that, with this order, the seted number, forget restrain 5 hundreds, one tens and vi units, a procedure that depends on the syntactic element (McCloskey et al., 1985).Dyscalculic learners may present difficulties on one of the subsystems of the number affect system and accordingly, on one of the units or the elements that these devil subsystems include. Specifically, a research by Benson and Denckla (1969) with one dyscalculic individual, revealed a difficulty in the intersection of come of both forms and in the lexical process of poetry, whereas the individuals knowledge and syntactic bear on components, were fine. In addition, McCloskey et al. (1985) sight in dickens dyscalculic individuals, that one of them had diffic ulties in distinguishing the magnitude of two come when those numbers were presented verbally, and the other individual had difficulties when the numbers were presented digitally. take down though the difficulties indicated by Benson and Denckla (1969) and McCloskey et al. (1985) are difficulties that a person could notice in dyscalculic learners, one cannot be sure about the reliableness of the results of the special(prenominal) studies, because the ingest they utilise was really small and because the studies took place several years ago, and consequently the particular results, may not be adequate for today. However, some of these difficulties, like in the case were the individual had to equal two numbers about their magnitude, seem to be associated to the concept of numerosity mentioned above, and therefrom these difficulties, may be able in characterising dyscalculic learners.Regarding the figuring system that was indicated by McCloskey et al. (1985), it is effected by trine units and it depends in some point on the number touch system. These tercet units, work one by one from each other, and earn to do, with the way the maths images, or linguistic process, are processed, with the arithmetic facts, and with the calculation procedures (McCloskey et al., 1985, p. 179).The first unit refers to the ability of a person to understand what calculation he must do, in congener to the maths sign or word that is presented to him (McCloskey et al., 1985). For example, when a person sees the symbol x or hears the word multiply, he knows that the process he must do, is extension. However, a dyscalculic learner may project the arithmetic symbols and, however though he may know the right reception, he may react in de endpointinely. Something kindred happens when the arithmetic symbols are presented with words, unless with the difference that when maths problems are colligate to language, there is a flavor by several researchers (Reid, 2003 Ben nett, 2006) that these problems are more associated to maths dyslexia preferably than to dyscalculia, and indeed this intimation is more connect to to the co cosmea of dyscalculia and dyslexia, rather than to dyscalculia itself. Overall, difficulties with the arithmetic symbols or words may be generated by visuospatial (Rourke, 1993) or language difficulties (Reid, 2003 Bennett, 2006) that sometimes characterise dyscalculic learners, thus dyscalculia can be characterised by difficulties with the working(a) symbols as well.The cooperate unit is related to the ability of an individual to advance and cerebrate from his extensive consideration memory, the lay out manages of special(prenominal) mathematical facts (McCloskey et al., 1985). An example of arithmetic facts, is the knowledge of a learner about the times tables. This unit is self-sufficing from the first one, because a learner may fix difficulties in recognising the operating theateral symbol, but his ans wer may be right-hand(a) when other symbol is used, or he may do the right operation but determine the inconclusive arithmetical fact. For example, Ferro and Botelho (1980), notice in a dyscalculic learner, that rather of adding two numbers when she byword the symbol +, like for example 9 + 2, she reckon them and answered 18 instead of 11. In addition, McCloskey et al. (1985) observe that a dyscalculic individual couldnt recover the correct answer in a case of multiplication, redden though he mum the concept of multiplication adequately. some(prenominal) dyscalculic learners may face difficulties in learning or in retrieving arithmetical facts (Russell and Ginsburg, 1984 Kirby and Becker, 1988 Geary, 1993 Temple, 1994 Ginsburg, 1997 Jordan and Montani, 1997 Geary and Hoard, 2001 Shalev and primitive Tsur, 2001), and a effort for this may be the fact, that some dyscalculic individuals call for difficulties with their working memory (Geary, 1993) or with their long t erm memory, as well (Reid, 2003). This, may limit the ability of a learner to moderate or to rally a mathematical fact from his long term memory, and therefore to cause him difficulties that characterise dyscalculia.The third unit of the calculation system refers to the abilities that learners maintain in making mathematical calculations (McCloskey et al., 1985). These abilities are related to the way learners apprehend and learn the procedures of performance math calculations, something that in dyscalculic learners is normally impaired (McCloskey et al., 1985 Temple, 1994 Butterworth, 2005). For example, dyscalculics may have difficulties in complete procedures in which they have to hunt down a number, whilst doing a maths operation, because of the fact that they may put the number on the treat place, something that leads to wrong calculations. Also, they may have difficulties with procedures, in which they must do two different mathematical operations at the same time. both(prenominal) of these difficulties, may be the result of accompanying difficulties (Bennett, 2006), or again of memory difficulties (Geary, 1993 Reid, 2003), that are considered to be related to dyscalculia, and therefore dyscalculics may face this kind of difficulties, as well.The specific model for number impact and calculation abilities, even though it was created several years ago, is in general lines, fit in explaining this type of abilities, in relation to dyscalculia. In addition, the aspects set forth in the model, seem to be have a ballpark terra firma with the numerosity, expound above, regarding the causes of the difficulties that dyscalculics may present. Therefore, one can assume that similar methods can be used, in order to stand by a dyscalculic learner to limit his difficulties with numerosity and with number processing and calculation abilities. Specifically, several researchers suggest that multi centripetal methods (Bennett, 2006) in crew with the l earners learning styles (Chinn, 2001 Marolda and Davidson, 2000 Sharma, 1989) can be zippy in direction and dower dyscalculic learners. This is because, by focalization on the way that an individual learns the best, one can alleviate this individual to storage plain the concepts of numerosity and of number processing and calculation, in the greatest extent, and by use multi sensational methods, he testament make the learning for the individual to be fun, less stressing and more motivating. With this way, the learner will believably feel more confident, and therefore more located to correct his difficulties in mathematics.In conclusion, dyscalculia is a really recent issue in the area of learning difficulties, and

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