["i6-i8","o15-o13","i8-i10","i15-i13","i3-i9","o13-o11","r6-r8","r15-r13","r8-r10","r18-r14","i9-c9","r14-p14","r3-r7","c18-c16","c9-d9","p14-p12","r7-r6","p12-p14","r6-q6","o11-o9","q6-r6","p14-p10","s10-r11","o10-q10"]