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- 11:31, 20 March 2013 (diff | hist) . . (+30) . . 1978 USAMO Problems/Problem 1 (→Solution)
- 11:30, 20 March 2013 (diff | hist) . . (+395) . . 1978 USAMO Problems/Problem 1 (http://image.ohozaa.com/view2/vUGiXdRQdAPyw036)
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