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•Formally-Derivable（可形式化推导/复现的证据）：通过符号推导、数值计算、仿真实验等可复现程序得到。
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Армия обороны Израиля начала масштабную серию ударов по Ирану02:17
by building up a tree of which queries depend on the results of which other ones,
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int getDigit(int num, int digit) {