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Published May 25, 2013 at 1632 × 1224 in Caltech Ditch Day 2013
Each of us has a personal number and 4 numbers we're supposed to obtain by trading with each other. In no time, we've devised a strategy to solve the puzzle.

Each of us has a personal number and 4 numbers we’re supposed to obtain by trading with each other. In no time, we’ve devised a strategy to solve the puzzle.

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