What makes a jersey # "illegal" as per any given rule book dictate? Is it due to the perceived difficulty that refs would have when signaling the jersey number with hands at the score table? [For example, to signal, a foul on number 78 might require the ref to be polydactyl], or, is it cosmetic appearance of an odd number like 19 or 37. Exactly why are some jersey numbers classified as "illegal" and others not so?
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