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On this page are computer-accessible forms for the graph C4[ 120, 20 ] = PX(15,3).

(I) Following is a form readable by MAGMA:

g:=Graph<120|{ {8, 15}, {112, 119}, {104, 111}, {56, 63}, {48, 55}, {40, 47}, {16, 23}, {24, 31}, {32, 39}, {64, 71}, {72, 79}, {80, 87}, {88, 95}, {96, 103}, {1, 9}, {112, 120}, {49, 57}, {48, 56}, {16, 24}, {17, 25}, {32, 40}, {33, 41}, {64, 72}, {65, 73}, {80, 88}, {81, 89}, {96, 104}, {97, 105}, {2, 11}, {103, 110}, {55, 62}, {50, 59}, {39, 46}, {7, 14}, {18, 27}, {23, 30}, {34, 43}, {66, 75}, {71, 78}, {82, 91}, {87, 94}, {98, 107}, {6, 12}, {103, 109}, {102, 108}, {55, 61}, {54, 60}, {39, 45}, {7, 13}, {22, 28}, {23, 29}, {38, 44}, {70, 76}, {71, 77}, {86, 92}, {87, 93}, {1, 10}, {52, 63}, {49, 58}, {4, 15}, {17, 26}, {20, 31}, {33, 42}, {36, 47}, {65, 74}, {68, 79}, {81, 90}, {84, 95}, {97, 106}, {100, 111}, {5, 9}, {53, 57}, {21, 25}, {37, 41}, {69, 73}, {85, 89}, {101, 105}, {3, 14}, {102, 107}, {54, 59}, {51, 62}, {6, 11}, {19, 30}, {22, 27}, {35, 46}, {38, 43}, {67, 78}, {70, 75}, {83, 94}, {86, 91}, {99, 110}, {2, 12}, {51, 61}, {50, 60}, {3, 13}, {18, 28}, {19, 29}, {34, 44}, {35, 45}, {66, 76}, {67, 77}, {82, 92}, {83, 93}, {98, 108}, {99, 109}, {5, 10}, {53, 58}, {21, 26}, {37, 42}, {69, 74}, {85, 90}, {101, 106}, {4, 16}, {108, 120}, {44, 56}, {12, 24}, {36, 48}, {68, 80}, {76, 88}, {100, 112}, {8, 16}, {105, 113}, {104, 112}, {41, 49}, {40, 48}, {9, 17}, {72, 80}, {73, 81}, {10, 19}, {111, 118}, {106, 115}, {47, 54}, {42, 51}, {15, 22}, {74, 83}, {79, 86}, {14, 20}, {111, 117}, {110, 116}, {47, 53}, {46, 52}, {15, 21}, {78, 84}, {79, 85}, {9, 18}, {108, 119}, {105, 114}, {44, 55}, {41, 50}, {12, 23}, {73, 82}, {76, 87}, {13, 17}, {109, 113}, {45, 49}, {77, 81}, {11, 22}, {110, 115}, {107, 118}, {46, 51}, {43, 54}, {14, 19}, {75, 86}, {78, 83}, {10, 20}, {107, 117}, {106, 116}, {43, 53}, {42, 52}, {11, 21}, {74, 84}, {75, 85}, {13, 18}, {109, 114}, {45, 50}, {77, 82}, {20, 32}, {28, 40}, {84, 96}, {92, 104}, {24, 32}, {25, 33}, {88, 96}, {89, 97}, {26, 35}, {31, 38}, {90, 99}, {95, 102}, {30, 36}, {31, 37}, {94, 100}, {95, 101}, {25, 34}, {28, 39}, {89, 98}, {92, 103}, {29, 33}, {93, 97}, {27, 38}, {30, 35}, {91, 102}, {94, 99}, {26, 36}, {27, 37}, {90, 100}, {91, 101}, {29, 34}, {93, 98}, {1, 113}, {8, 120}, {3, 114}, {6, 119}, {4, 118}, {5, 119}, {2, 113}, {7, 116}, {1, 117}, {60, 72}, {52, 64}, {3, 118}, {6, 115}, {4, 114}, {5, 115}, {2, 117}, {56, 64}, {57, 65}, {58, 67}, {63, 70}, {62, 68}, {63, 69}, {57, 66}, {60, 71}, {8, 116}, {61, 65}, {59, 70}, {62, 67}, {58, 68}, {59, 69}, {7, 120}, {61, 66} }>;

(II) A more general form is to represent the graph as the orbit of {8, 15} under the group generated by the following permutations:

a: (1, 3)(2, 4)(5, 7)(6, 8)(9, 13)(10, 14)(11, 15)(12, 16)(113, 114)(115, 116)(117, 118)(119, 120)
b: (89, 90)(91, 92)(93, 94)(95, 96)(97, 99)(98, 100)(101, 103)(102, 104)(105, 109)(106, 110)(107, 111)(108, 112)
c: (25, 26)(27, 28)(29, 30)(31, 32)(33, 35)(34, 36)(37, 39)(38, 40)(41, 45)(42, 46)(43, 47)(44, 48)
d: (57, 58)(59, 60)(61, 62)(63, 64)(65, 67)(66, 68)(69, 71)(70, 72)(73, 77)(74, 78)(75, 79)(76, 80)
e: (81, 82)(83, 84)(85, 86)(87, 88)(89, 91)(90, 92)(93, 95)(94, 96)(97, 101)(98, 102)(99, 103)(100, 104)
f: (17, 18)(19, 20)(21, 22)(23, 24)(25, 27)(26, 28)(29, 31)(30, 32)(33, 37)(34, 38)(35, 39)(36, 40)
g: (49, 50)(51, 52)(53, 54)(55, 56)(57, 59)(58, 60)(61, 63)(62, 64)(65, 69)(66, 70)(67, 71)(68, 72)
h: (73, 74)(75, 76)(77, 78)(79, 80)(81, 83)(82, 84)(85, 87)(86, 88)(89, 93)(90, 94)(91, 95)(92, 96)
m: (9, 10)(11, 12)(13, 14)(15, 16)(17, 19)(18, 20)(21, 23)(22, 24)(25, 29)(26, 30)(27, 31)(28, 32)
n1: (41, 42)(43, 44)(45, 46)(47, 48)(49, 51)(50, 52)(53, 55)(54, 56)(57, 61)(58, 62)(59, 63)(60, 64)
a1: (97, 98)(99, 100)(101, 102)(103, 104)(105, 107)(106, 108)(109, 111)(110, 112)(113, 117)(114, 118)(115, 119)(116, 120)
b1: (65, 66)(67, 68)(69, 70)(71, 72)(73, 75)(74, 76)(77, 79)(78, 80)(81, 85)(82, 86)(83, 87)(84, 88)
c1: (33, 34)(35, 36)(37, 38)(39, 40)(41, 43)(42, 44)(45, 47)(46, 48)(49, 53)(50, 54)(51, 55)(52, 56)
d1: (1, 2)(3, 4)(5, 6)(7, 8)(9, 11)(10, 12)(13, 15)(14, 16)(17, 21)(18, 22)(19, 23)(20, 24)
e1: (2, 5)(4, 7)(9, 113)(10, 117)(11, 115)(12, 119)(13, 114)(14, 118)(15, 116)(16, 120)(17, 105)(18, 109)(19, 107)(20, 111)(21, 106)(22, 110)(23, 108)(24, 112)(25, 97)(26, 101)(27, 99)(28, 103)(29, 98)(30, 102)(31, 100)(32, 104)(33, 89)(34, 93)(35, 91)(36, 95)(37, 90)(38, 94)(39, 92)(40, 96)(41, 81)(42, 85)(43, 83)(44, 87)(45, 82)(46, 86)(47, 84)(48, 88)(49, 73)(50, 77)(51, 75)(52, 79)(53, 74)(54, 78)(55, 76)(56, 80)(57, 65)(58, 69)(59, 67)(60, 71)(61, 66)(62, 70)(63, 68)(64, 72)
f1: (1, 9, 17, 25, 33, 41, 49, 57, 65, 73, 81, 89, 97, 105, 113)(2, 10, 18, 26, 34, 42, 50, 58, 66, 74, 82, 90, 98, 106, 114)(3, 11, 19, 27, 35, 43, 51, 59, 67, 75, 83, 91, 99, 107, 115)(4, 12, 20, 28, 36, 44, 52, 60, 68, 76, 84, 92, 100, 108, 116)(5, 13, 21, 29, 37, 45, 53, 61, 69, 77, 85, 93, 101, 109, 117)(6, 14, 22, 30, 38, 46, 54, 62, 70, 78, 86, 94, 102, 110, 118)(7, 15, 23, 31, 39, 47, 55, 63, 71, 79, 87, 95, 103, 111, 119)(8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96, 104, 112, 120)

(III) Last is Groups&Graphs. Copy everything between (not including) the lines of asterisks into a plain text file and save it as "graph.txt". Then launch G&G (Groups&Graphs) and select Read Text from the File menu.

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&Graph
C4[ 120, 20 ]
120
-1 113 117 9 10
-2 11 12 113 117
-3 13 14 114 118
-4 15 114 16 118
-5 115 9 119 10
-6 11 12 115 119
-7 13 14 116 120
-8 15 16 116 120
-9 1 5 17 18
-10 1 5 19 20
-11 22 2 6 21
-12 23 2 24 6
-13 3 17 7 18
-14 3 7 19 20
-15 22 4 8 21
-16 23 24 4 8
-17 13 25 26 9
-18 13 27 28 9
-19 14 29 30 10
-20 14 31 10 32
-21 11 25 15 26
-22 11 15 27 28
-23 12 16 29 30
-24 12 16 31 32
-25 33 34 17 21
-26 35 36 17 21
-27 22 37 38 18
-28 22 39 18 40
-29 33 23 34 19
-30 23 35 36 19
-31 24 37 38 20
-32 24 39 40 20
-33 25 29 41 42
-34 44 25 29 43
-35 45 46 26 30
-36 47 26 48 30
-37 27 41 31 42
-38 44 27 31 43
-39 45 46 28 32
-40 47 48 28 32
-41 33 37 49 50
-42 33 37 51 52
-43 34 38 53 54
-44 55 34 56 38
-45 35 49 39 50
-46 35 39 51 52
-47 36 40 53 54
-48 55 56 36 40
-49 45 57 58 41
-50 45 59 60 41
-51 46 61 62 42
-52 46 63 42 64
-53 57 47 58 43
-54 47 59 60 43
-55 44 48 61 62
-56 44 48 63 64
-57 66 49 53 65
-58 67 68 49 53
-59 69 70 50 54
-60 71 50 72 54
-61 55 66 51 65
-62 55 67 68 51
-63 56 69 70 52
-64 56 71 72 52
-65 57 61 73 74
-66 57 61 75 76
-67 77 78 58 62
-68 79 58 80 62
-69 59 73 63 74
-70 59 63 75 76
-71 77 78 60 64
-72 79 80 60 64
-73 69 81 82 65
-74 69 83 84 65
-75 66 70 85 86
-76 66 88 70 87
-77 67 81 71 82
-78 67 71 83 84
-79 68 72 85 86
-80 88 68 72 87
-81 77 89 90 73
-82 77 91 92 73
-83 78 93 94 74
-84 78 95 74 96
-85 89 79 90 75
-86 79 91 92 75
-87 80 93 94 76
-88 80 95 96 76
-89 81 85 97 98
-90 99 100 81 85
-91 101 102 82 86
-92 103 82 104 86
-93 83 97 87 98
-94 99 100 83 87
-95 88 101 102 84
-96 88 103 104 84
-97 89 93 105 106
-98 89 93 107 108
-99 110 90 94 109
-100 111 90 112 94
-101 91 105 95 106
-102 91 95 107 108
-103 110 92 96 109
-104 111 112 92 96
-105 101 113 114 97
-106 101 115 116 97
-107 102 117 118 98
-108 102 119 98 120
-109 99 113 103 114
-110 99 103 115 116
-111 100 104 117 118
-112 100 104 119 120
-113 1 2 105 109
-114 3 4 105 109
-115 110 5 6 106
-116 110 7 106 8
-117 1 111 2 107
-118 111 3 4 107
-119 112 5 6 108
-120 112 7 8 108
0

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