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View story Additional Abacus Resources 6 / 2 http://www.ee.ryerson.ca/~elf/abacus/afurther.html Submitted by joserra 63 months, 2 weeks, 2 days, 1 hour ago Do you want to exercise your mind? Stop using your calculator! Tags: abacus comment (0) | Category: Tech stuff | Add joserra as a source Comments Votes (my sources) Votes (Everyone) « go back

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