2+1=3
3+2-1=4
((4+3)-2)*1=5
((5-4)*3)*2*1=6
(((6+5)+4)*3)+2*1=7
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2+1=3
3+2-1=4
((4+3)-2)*1=5
((5-4)*3)*2*1=6
(((6+5)+4)*3)+2*1=7