["r3-r6","o15-o12","r6-r8","n12-q9","r6-r7","b15-e12","s7-p10","k15-n12","o3-r6","p18-p15","c3-c4","p15-p12","n7-o7","s18-p18","q6-n9","h15-k12","n9-n11","k10-l11","n10-o11","l12-n12","k6-n9","r13-q12","o9-o10","o13-o12","i3-i6","g18-g15","i6-l6","j18-j8","e6-h9","e12-h9","m6-m16"]