Let's do it: [1, 0, 0, 1, 1, 1] 010 phase done: [1, 0, 0, 1, 1, 1] tmpstr 011 (-011) Now: [1, 0, 1, 1] i 1 tmpstr2 101 tmpstr 011 (-011) Now: [1, 1] 7 2 1 1 1 2 1 1