Danny Gregory (Everday Matters) is offering some nice prizes for the best illustrated letters he receives before Christmas.
I think this is a fun idea!
Sphinx Cryptarithm #36
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From Sphinx Magazine, October 1933 Reconstruct the multiplication: where:
OCTO, CTO, CTOB, TO, TOBR, TOBRE, OBRE, BRE, BR, RE, E are 11 prime
numbers. The ...
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