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```
def mask \
...


__END__
```

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-10 = (4 - (2 + (5 + 7)))
-10 = (4 - (2 + (7 + 5)))
...
-10 = (((4 - 5) - 7) - 2)
-10 = (((4 - 7) - 5) - 2)
-10 = (((5 - 7) * 4) - 2)