Number 1, 2, 3, 4, 5, 6. Add a negative sign before some of them to make their sum 1. Please list all the formulas

Number 1, 2, 3, 4, 5, 6. Add a negative sign before some of them to make their sum 1. Please list all the formulas


1+2+3+4+5+6=21
So you need to subtract 20, that is, add a minus sign before the number of 10
1+2+3+4=10
1+3+6=10
1+4+5=10
2+3+5=10
4+6=10
So all the formulas are
-1-2-3-4+5+6=1
-1+2-3+4+5-6=1
-1+2+3-4-5+6=1
1-2-3+4-5+6=1
1+2+3-4+5-6=1

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