c 1 has at least one matched edge
112 105 102 0
c no two edges of 1 are in the matching
-105 -112 0
-102 -112 0
-102 -105 0
c 2 has at least one matched edge
211 203 102 0
c no two edges of 2 are in the matching
-203 -211 0
-102 -211 0
-102 -203 0
c 3 has at least one matched edge
315 203 304 0
c no two edges of 3 are in the matching
-203 -315 0
-203 -304 0
-304 -315 0
c 4 has at least one matched edge
414 304 405 0
c no two edges of 4 are in the matching
-304 -414 0
-304 -405 0
-405 -414 0
c 5 has at least one matched edge
513 405 105 0
c no two edges of 5 are in the matching
-405 -513 0
-105 -513 0
-105 -405 0
c 6 has at least one matched edge
616 607 610 0
c no two edges of 6 are in the matching
-607 -616 0
-607 -610 0
-610 -616 0
c 7 has at least one matched edge
720 708 607 0
c no two edges of 7 are in the matching
-708 -720 0
-607 -720 0
-607 -708 0
c 8 has at least one matched edge
819 809 708 0
c no two edges of 8 are in the matching
-809 -819 0
-708 -819 0
-708 -809 0
c 9 has at least one matched edge
918 910 809 0
c no two edges of 9 are in the matching
-910 -918 0
-809 -918 0
-809 -910 0
c 10 has at least one matched edge
1017 910 610 0
c no two edges of 10 are in the matching
-910 -1017 0
-610 -1017 0
-610 -910 0
c 11 has at least one matched edge
1117 1116 211 0
c no two edges of 11 are in the matching
-1116 -1117 0
-211 -1117 0
-211 -1116 0
c 12 has at least one matched edge
1220 1216 112 0
c no two edges of 12 are in the matching
-1216 -1220 0
-112 -1220 0
-112 -1216 0
c 13 has at least one matched edge
1320 1319 513 0
c no two edges of 13 are in the matching
-1319 -1320 0
-513 -1320 0
-513 -1319 0
c 14 has at least one matched edge
1419 1418 414 0
c no two edges of 14 are in the matching
-1418 -1419 0
-414 -1419 0
-414 -1418 0
c 15 has at least one matched edge
1518 1517 315 0
c no two edges of 15 are in the matching
-1517 -1518 0
-315 -1518 0
-315 -1517 0
c 16 has at least one matched edge
616 1116 1216 0
c no two edges of 16 are in the matching
-616 -1116 0
-616 -1216 0
-1116 -1216 0
c 17 has at least one matched edge
1017 1517 1117 0
c no two edges of 17 are in the matching
-1017 -1517 0
-1017 -1117 0
-1117 -1517 0
c 18 has at least one matched edge
918 1418 1518 0
c no two edges of 18 are in the matching
-918 -1418 0
-918 -1518 0
-1418 -1518 0
c 19 has at least one matched edge
819 1319 1419 0
c no two edges of 19 are in the matching
-819 -1319 0
-819 -1419 0
-1319 -1419 0
c 20 has at least one matched edge
720 1220 1320 0
c no two edges of 20 are in the matching
-720 -1220 0
-720 -1320 0
-1220 -1320 0
