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(0,0) -> (5, 3) 平面路径，步 (+1,0) 或 (0,+1) 。（答： \binom83 = 56 。）
(0,0) -> (5, 3) 平面路径，步 (+1,0) 或 (0,+1) 。（答： \binom83 = 56 。）
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