“…6. Likewise, the optimal routes obtained by IABC on other three instances are {0, 18, 17, 4, 2, 1, 0, 3, 20, 19, 9, 8, 0, 15, 16, 0, 5, 6, 7, 0, 10, 14, 13, 11, 12, 0}, {0, 3, 19, 20, 4, 0, 6, 1, 0, 7, 8, 9, 5, 0, 10, 23, 18, 0, 15, 14, 11, 0, 2, 21, 0, 17, 13, 12, 0, 22, 16, 25, 24, 0}, and {0, 28, 30, 9, 10, 0, 23,26,18,0,11,29,25,4,0,27,19,17,5,3,7, 0, 2, 15, 14, 0, 24, 8, 21, 1, 20, 0, 16, 22, 6, 0, 12, 13, 0}, respectively. Figures 7−9 depict their routes.…”