(0,0)(1,1)(2,2)(3,3)(4,4)[2] (0,0)(1,1)(2,2)(3,3)(4,3)(5,3)[2] (0,0)(1,1)(2,2)(3,3)(4,3)(5,2)(6,3)(7,3)(8,2)(9,3)(10,3)[2] (0,0)(1,1)(2,2)(3,3)(4,3)(5,2)(6,3)(7,3)(8,2)(9,3)(10,2)(11,3)(12,2)(13,3)[2] (0,0)(1,1)(2,2)(3,3)(4,3)(5,2)(6,3)(7,3)(8,2)(9,3)(10,2)(11,3)(12,2)(13,2)(14,2)[2] Length of sequence exceeds 20 at next step.Permalink of this result