["i6-i9","i15-i12","e6-g8","i12-i11","g8-h9","e14-h14","i9-i12","i15-i14","r6-r9","i14-i11","r9-r12","n15-q12","r3-r10","r15-r12","r9-r10","r18-r12","m6-j9","r12-l12","h9-j11","m12-l12","p7-m7","k12-k8","e3-e6","k8-k5"]