lyndon 7 b 2 0,0,0,0,0,0,0 0,0,0,0,0,0,0 0,0,0,0,0,0,0 0,0,0,0,0,0,0 0,4,5,6,0,0,0 0,5,5,5,0,0,0 0,6,6,6,0,0,0