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In an undirected graph, (i,j) means that node i and node j are connected with an undirected edge.
The nodes are numbered from 0 to 27, and the edges are: (0,11) (0,20) (1,12) (1,5) (1,2) (1,16) (1,17) (1,25) (1,6) (1,21) (1,7) (1,3) (1,15) (1,23) (1,4) (1,24) (1,9) (1,27) (1,10) (2,8) (2,26) (2,5) (2,19) (2,18) (2,16) (2,6) (2,21) (2,7) (2,3) (2,23) (2,24) (2,9) (2,10) (3,8) (3,26) (3,12) (3,5) (3,22) (3,19) (3,18) (3,17) (3,6) (3,21) (3,7) (3,15) (3,23) (3,4) (3,24) (3,9) (3,27) (3,10) (4,14) (4,26) (4,12) (4,5) (4,22) (4,19) (4,18) (4,16) (4,17) (4,25) (4,6) (4,21) (4,7) (4,15) (4,23) (4,24) (4,9) (4,27) (5,14) (5,26) (5,12) (5,19) (5,16) (5,17) (5,6) (5,21) (5,7) (5,15) (5,23) (5,24) (5,9) (5,27) (6,8) (6,26) (6,12) (6,19) (6,16) (6,17) (6,25) (6,21) (6,7) (6,15) (6,24) (6,9) (6,27) (7,14) (7,26) (7,22) (7,19) (7,18) (7,16) (7,17) (7,25) (7,21) (7,15) (7,23) (7,24) (7,9) (7,27) (8,14) (8,12) (8,22) (8,19) (8,18) (8,16) (8,17) (8,25) (8,21) (8,15) (8,23) (8,24) (8,9) (8,27) (8,10) (9,14) (9,26) (9,12) (9,22) (9,19) (9,18) (9,16) (9,21) (9,15) (9,23) (9,24) (9,27) (9,10) (10,14) (10,26) (10,22) (10,19) (10,18) (10,16) (10,17) (10,25) (10,21) (10,15) (10,23) (10,24) (10,27) (11,20) (11,13) (12,14) (12,26) (12,22) (12,19) (12,18) (12,16) (12,17) (12,25) (12,21) (12,15) (12,23) (13,20) (14,26) (14,22) (14,16) (14,17) (14,15) (14,23) (14,27) (15,26) (15,22) (15,18) (15,16) (15,25) (15,24) (16,26) (16,18) (16,17) (16,23) (16,27) (17,26) (17,19) (17,25) (17,24) (17,27) (18,26) (18,19) (18,25) (18,21) (18,23) (18,24) (18,27) (19,26) (19,25) (19,24) (21,26) (21,22) (21,25) (21,24) (21,27) (22,26) (22,24) (22,27) (23,24) (24,25) (24,27) (25,26) (25,27) (26,27).