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Stories tagged with: abacus Additional Abacus Resources 6 / 2 http://www.ee.ryerson.ca/~elf/abacus/afurther.html Do you want to exercise your mind? Stop using your calculator! Join discussion... Submitted by joserra 60 months, 2 hours ago Tags: abacus comment (0) | Category: Tech stuff | Add joserra as a source

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