1+1=, 3-1=, 2+2=, 5-2=, 4+2=, 7-2=, 6+1=, 9-1+2=, 8+1=, 2-2=, 5-1-1=, 2+2+1=, 2+1-2=, 7+1-2=, 9-2+1=.

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