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Tiu U means "fishing". This is a game for two or three players, using two sets of Chinese dominoes (64 tiles in all). Each set consists of all pairs of numbers from 1-1 to 6-6, with the following eleven tiles duplicated: 6-6, 6-5, 6-4, 6-1, 5-5, 5-1, 4-4, 3-3, 3-1, 2-2, 1-1.

Here is a link to the rules of Tiu U, compiled by Joe Celko.