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ya..I remember doing one of these things a couple of years back. I bought a book off my neighbour's yard sale, and it was a puzle book. I remember trying to do one of the problems. I can't remember much about it, except for the fact I ended up with a 7 x 7 square. It wasted 2 hours or so of my life.
These things are fairly common, and I know one person who could probably do this question in her head 
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