Let's do it: [0, 1, 1, 0, 0, 1] 010 phase done: [0, 1, 1, 0, 0, 1] tmpstr 100 i 0 tmpstr 001 i 1 tmpstr2 011 (-011) Now: [0, 1, 0, 1] i 2 tmpstr2 010 (-010) Now: [1, 1] 4 2 1 1 1