["c6-c9","c15-c12","c9-c10","f15-f12","b11-e11","j15-g12","c3-d3","g12-d9","g6-d9","f18-e17","r3-r5","e17-n8","k6-l7","o8-n8","r6-r5","i18-i8","r5-r13","i8-e8","s12-r13","e8-d9","d3-d7","d10-e9","i3-i18","n8-n5"]