If you have to rely on the differentiation between the sound of curves and straight lines coupled with breaks, you cannot use all the numbers available because some sound too much alike. Those which are not likely to sound similar are:—1, 3, 4, 5, 6, 7, 8. Two is omitted because it sounds like seven uhen written, and nine because it sounds like six or seven depending on how you write it. Fortunately, you can tell after some practice the following letters of the alphabet: C.H.S.D. which means that numbers, although incomplete are of use—since playing cards can be used to confine the choice and of the fifty-two available only eight number or spot cards have to be removed and a simple instruction covers the court cards which can be left »n the deck: "Choose any card you like—but to avoid complexity, I advise you to ignore the court cards".
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To do this successfully you need to build a clear path of action by using tools if necessary. These tools would be facts, evidence and stories which you know they can relate to. Plus you always want to have their best interests at heart, in other words, you know what is good for them