N = a + 0x10 * b + 0x100 * c + ...で (a + b + c + ...) が 0xF の倍数なら N が0xFの倍数になるのか検証したくなってきたな
これだめじゃん、倍数が0xFという仮定はだいぶ頭おかしいな
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