PD[X[51, 37, 52, 36], X[66, 38, 67, 37], X[9, 39, 10, 38], X[24, 40, 25, 39], X[67, 53, 68, 52], X[10, 54, 11, 53], X[25, 55, 26, 54], X[40, 56, 41, 55], X[11, 69, 12, 68], X[26, 70, 27, 69], X[41, 71, 42, 70], X[56, 72, 57, 71], X[27, 13, 28, 12], X[42, 14, 43, 13], X[57, 15, 58, 14], X[72, 16, 1, 15], X[43, 29, 44, 28], X[58, 30, 59, 29], X[1, 31, 2, 30], X[16, 32, 17, 31], X[59, 45, 60, 44], X[2, 46, 3, 45], X[17, 47, 18, 46], X[32, 48, 33, 47], X[3, 61, 4, 60], X[18, 62, 19, 61], X[33, 63, 34, 62], X[48, 64, 49, 63], X[19, 5, 20, 4], X[34, 6, 35, 5], X[49, 7, 50, 6], X[64, 8, 65, 7], X[35, 21, 36, 20], X[50, 22, 51, 21], X[65, 23, 66, 22], X[8, 24, 9, 23]]
