One plus two equals three., 1 + 2 = 3, Four minus one equals three., 4 - 1 = 3, Two plus one equals three., 2 + 1 = 3, Three minus two equals one., 3 - 2 = 1, Two plus two equals four., 2 + 2 = 4, Four minus three equals one., 4 - 3 = 1

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