| 6, 9, 66, 99, 333, 363, 393, 636, 666, 696, 939, 969, 999, 3333, 3663, 3993, 6336, 6666, 6996, 9339, 9669, 9999, 30303, 30603, 30903, 33333, 33633, 33933, 36363, 36663, 36963, 39393, 39693, 39993, 60306, 60606, 60906, 63336, 63636, 63936
(list; graph; listen)
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