R7:=Matrix([ [7,2,0,2,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [7,6,2,0,4,0,1,1,0,2,4,0,2,0,2,0,1,0,0,0,2,2,0,0,2,0,0,0,0,0,0,0,0,0], [0,2,6,2,0,4,0,0,0,0,0,3,0,3,0,2,0,2,0,2,0,0,4,0,0,0,0,0,0,0,0,0,0,0], [0,0,1,5,0,0,1,1,0,0,0,0,2,0,2,0,0,0,2,0,0,0,0,2,2,0,0,0,0,4,0,0,0,0], [0,2,0,0,5,0,0,0,0,0,0,1,0,1,0,0,0,1,0,1,0,0,0,0,0,4,2,0,0,0,2,0,2,0], [0,0,2,0,1,6,2,2,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,1,0,2,5,0,1,0,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,1,4,2,2,0,0,0,0,0], [0,0,0,1,0,2,0,5,1,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0,0,1,0,2,0,0,4,2,0,0], [0,0,0,0,0,0,1,1,5,2,0,0,0,0,0,0,2,0,1,0,2,2,0,2,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,1,4,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0,2,0,0,2,1,4], [0,2,0,0,0,0,0,0,0,0,5,1,0,1,0,2,0,0,0,0,0,0,0,0,0,2,0,2,2,0,0,2,0,0], [0,0,1,0,1,0,1,0,0,0,1,5,3,0,0,0,1,0,2,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,1,0,0,0,0,0,0,0,1,4,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,1,3,0], [0,0,1,0,1,0,0,1,0,0,1,0,0,5,3,0,1,0,2,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,1,0,0,0,0,0,0,0,0,0,1,4,0,0,1,0,0,0,0,0,0,0,0,0,1,1,0,0,0,3,0], [0,0,1,0,0,0,1,1,0,0,2,0,0,0,0,5,2,0,0,0,0,0,0,2,2,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,2,0,0,1,0,1,0,2,5,2,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,1,0,0,0,0,1,0,1,4,0,0,1,0,0,0,1,0,0,0,0,2,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0,4,0,0,0,0,0,0,2,0,0,0,0,0,0,2,0], [0,0,0,0,0,0,0,0,0,1,0,0,1,0,0,0,1,0,0,4,0,1,0,0,1,0,0,0,0,2,0,0,0,0], [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,4,0,2,0,0,0,2,1,2,0,0,0,0,0], [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,1,0,4,2,0,0,0,0,1,0,0,2,2,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,4,2,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,0,0,0,0,1,0,0,1,0,4], [0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,1,0,1,0,1,0,0,0,0,4,0,2,0,0,0,2,0,0,4], [0,0,0,0,2,0,0,0,0,0,1,0,0,0,0,0,0,0,2,0,0,0,0,0,0,4,0,0,0,1,0,0,0,0], [0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,4,0,0,0,0,0,0,0], [0,0,0,0,0,0,1,1,0,0,0,0,1,0,1,0,0,0,0,0,1,1,0,0,0,0,0,4,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,1,0,0,1,0,0,0,0,3,1,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0,1,3,0,1,0,0], [0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0,4,0,0,0], [0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,3,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,3,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,2] ]); Nodes 0 : 1 0 3 2 5 4 7 6 9 8 11 10 13 12 1 : 1 0 3 2 5 4 7 6 9 8 13 12 11 10 2 : 1 0 3 2 5 4 7 6 13 10 9 12 11 8 3 : 1 0 3 2 5 4 7 6 13 12 11 10 9 8 4 : 1 0 3 2 5 4 9 8 7 6 13 12 11 10 5 : 1 0 3 2 5 4 13 8 7 10 9 12 11 6 6 : 1 0 3 2 5 4 13 8 7 12 11 10 9 6 7 : 1 0 3 2 5 4 13 10 9 8 7 12 11 6 8 : 1 0 3 2 5 4 13 12 9 8 11 10 7 6 9 : 1 0 3 2 5 4 13 12 11 10 9 8 7 6 10 : 1 0 3 2 7 6 5 4 9 8 13 12 11 10 11 : 1 0 3 2 7 6 5 4 13 10 9 12 11 8 12 : 1 0 3 2 7 6 5 4 13 12 11 10 9 8 13 : 1 0 3 2 9 6 5 8 7 4 13 12 11 10 14 : 1 0 3 2 9 8 7 6 5 4 13 12 11 10 15 : 1 0 3 2 13 6 5 10 9 8 7 12 11 4 16 : 1 0 3 2 13 6 5 12 9 8 11 10 7 4 17 : 1 0 3 2 13 6 5 12 11 10 9 8 7 4 18 : 1 0 3 2 13 8 7 6 5 12 11 10 9 4 19 : 1 0 3 2 13 10 9 8 7 6 5 12 11 4 20 : 1 0 3 2 13 12 7 6 11 10 9 8 5 4 21 : 1 0 3 2 13 12 9 8 7 6 11 10 5 4 22 : 1 0 3 2 13 12 11 8 7 10 9 6 5 4 23 : 1 0 3 2 13 12 11 10 9 8 7 6 5 4 24 : 1 0 5 4 3 2 7 6 13 12 11 10 9 8 25 : 1 0 5 4 3 2 9 8 7 6 13 12 11 10 26 : 1 0 5 4 3 2 13 8 7 12 11 10 9 6 27 : 1 0 5 4 3 2 13 10 9 8 7 12 11 6 28 : 1 0 5 4 3 2 13 12 11 10 9 8 7 6 29 : 1 0 7 6 5 4 3 2 13 12 11 10 9 8 30 : 1 0 9 6 5 4 3 8 7 2 13 12 11 10 31 : 1 0 9 8 7 6 5 4 3 2 13 12 11 10 32 : 1 0 13 6 5 4 3 12 11 10 9 8 7 2 33 : 1 0 13 12 11 10 9 8 7 6 5 4 3 2