["c3-c6","r18-r16","c6-c13","r16-r15","c13-c16","r15-r8","c16-c17","r8-r5","c17-d17","r5-r4","d17-e17","r4-q4","e17-f17","q4-p4","l3-l4","p4-o4","l4-m4","p4-o4"]