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1* -1+(-3)+5+6=7 5* -1+5+0+3=7

2* 5+(-2)+8+(-4)=7 6* -3+(-2)+9+3=7

3* 0+9+(-6)+4=7 7* 5+8+(-6)+2=7

4* 3+3+2+-1=7 8* 6+(-4)+4(-1)=7

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