Puzzle

Dave Cross dave at dave.org.uk
Tue Aug 28 15:14:13 BST 2012


Quoting Martin Atukunda <matlads at gmail.com>:

> Hmm, Am I right in thinking that the groupings should be related
> horizontally as well as vertically?

No. You're just partitioning the set into four disjoint sub-sets.

Dave...


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