Hexagonal grid. Determination of (1, 2) clusters (or (2, 1) clusters) in hexagon grid graphs and the clusters are {1, 2, 8}, {6, 12, 13}, {27, 34, 40, 41}, {7, 14, 21, 28}, {15, 16, 22, 29}, {43, 44, 49}, {3, 4, 9, 10, 11, 17, 18, 19, 20, 24, 25, 26, 32, 33, 38} and {23, 30, 31, 36, 37, 44, 45, 46, 47, 48, 50, 51, 52, 53, 54}.