Geometric problem?
Difference between en1 and en2, changed 0 character(s)
I need some hins for this problem "[City houses](http://coj.uci.cu/24h/problem.xhtml?pid=2067)", please help.

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  Rev. Lang. By When Δ Comment
en2 English WIL 2015-10-15 08:09:42 0 (published)
en1 English WIL 2015-10-15 07:44:44 127 Initial revision (saved to drafts)