["c6-c8","r15-r12","o6-o9","r18-r12","o3-p4","o18-r15","p4-n6","o15-o12","n6-m7","s15-r15","m7-h12","r12-r9","s4-p4","m13-l14","h6-k9","r9-q9","c8-c9","q9-q10","n9-o10","c18-c19","r3-r2","d14-b14","q7-s7","q14-r14","e7-g7","r15-s14","h3-h5","l15-k15"]