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p2+p2len -3-2-1 p2 +0+1+2 ... [c]>>>[c] *(p1+5) = *(p1+2) 2 *(p1 ++I) [3]<<<<<<<<<<<<<<[3] *(p1+2) = temp [1 2 3 a b c d e f]
p2+p2len -4-3-2-1 p2 +0+1+2+3 ... [4]<<<<<<<<<<<<<<<<<<<<[4] *(p1+3) = temp [1 2 3 4 a b c d e f g h i]