2-1 equals to, 0, 1, 2, 5+5+3-5, 8, 7, 6, 4+8(2)+1, 20, 22, 21, 2+2(2)+1/2, 6.5, 7.5, 5.5, 0/1, 0, 1, 2/1, 1/0, 0, 1, undetermined, 12/2+4/2, 7, 8, 9, 8/2+8/2, 8, 9, 10, 100-(99+1), 100, 99, 0, 5/2+4/2-1, 3, 3.5, 5.5

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