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"I was just guessing at numbers and figures Pulling your puzzles apart" [Coldplay]
A time such as 3:59:53 is palindromic, that is, it reads the same forward and backward. in a day starting from 0:00:00 to 23:59:59, there are 660 occasions when the time is palindromic. Among them which of the two is closest?
Source: Nobuyuki Yoshigahara
This lovely puzzle is from professor Tanya Khovanova's blog.
You are given a 5-by-7 rectangle with two corners cut out: A 1-by-1 tile is cut from the bottom left corner, and a 1-by-2 tile is cut out of the top right corner, as in the picture. The task is to cut the resulting shape into two congruent polyominoes.