1 8
1 0 -1 1 0 0 0 -1

-1

24 17
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1 0 0 0 0 4 3 0 0 0 -7 1 0 0 -1 0 0
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1 -1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0