0 1 2 3 4 5 6 7 8 
[a b c d e f 1 2 3] temp
      [d]>>>>>>>>>>>[d]             temp = *(p1+p1len+1)     // want to move [0]->[3] so put [3]->temp  (1)
[a]>>>[d]                        *(p1+p1len+1) = *(p1+0)     // [0]->[3]                                (2)
[e]<<<<<[e]                      *(p1+0) = *(p1+p1len+2)     // want to move [1]->[4] so put [4]->[0]   (3)
  [b]>>>[b]                      *(p1+p1len+2) = *(p1+1)     // [1]->[4]                                (4)
  [f]<<<<<[f]                    *(p1+1) = *(p1+p1len+3)     // want to move [2]->[5] so put [5]->[1]   (5)
    [c]>>>[c]                    *(p1+p1len+3) = *(p1+2)     // [2]->[5] leaving [2] free so            (6)
    [3]<<<<<<<<<[3]              *(p1+2) = *(p2+p2len-1)     // [2]<-[8] leaving [8] free so            (7)
  [f]>>>>>>>>>>>[f]              *(p2+p2len-1) = *(p1+1)     // [1]->[8] leaving [1] free so            (8)
  [2]<<<<<<<<<[2]                *(p1+1) = *(p2+p2len-2)     // [1]<-[7] leaving [7] free so            (9)
[e]>>>>>>>>>>>[e]                *(p2+p2len-2) = *(p1+0)     // [0]->[7] leaving [0] free so           (10)
[1]<<<<<<<<<[1]                  *(p1+0) = *(p2+p2len-3)     // [0]<-[6] which leaves [6] free         (11)
            [d]<<<<<[d]          *(p2+p2len-3) = temp;       // for the value in temp                  (12)
[1 2 3 a b c d e f]                                            m=6, n=3, moves= 6+3+(6-3) = 12