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The diagram below shows a complete set of dominoes. Find where all the dividing lines are.
NOTE: A typical set of dominoes consists of 28 dominoes with all pairs from
and through to If you have never seen a domino: The pair ab is the same as the pair ba.
Source: Andy Liu, Univ. of Alberta, in Mathematics and Informatics Quarterly, volume 9, no. 2, June 99 p. 76.© Copyright 1999 Stan Wagon. Reproduced with permission.