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p2+p2len            -3-2-1
p2                  +0+1+2
...
            [c]>>>[c]                 *(p1+5) = *(p1+2)
            [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
...
              [d]>>>>>[d]                    *(p1+7) = *(p1+3)
              [4]<<<<<<<<<<<<<<<<<<<<[4]     *(p1+3) =  temp
        [1 2 3 4 a b c d e f g h i]