[1,-2,2,-3,0,3,0,-4,0,4,-5,0,0,0,5,6,-6,-6,0,0,6,
-7,0,0,0,0,0,7,0,0,0,-8,0,0,0,8,0,0,-9,0,0,0,0,0,
9,10,-10,0,0,-10,0,0,0,0,10,-11,0,0,0,0,0,0,0,0,0,
11,0,12,0,-12,0,-12,0,0,0,0,0,12,-13,0,0,0,0,0,0,
0,0,0,0,0,13,14,-14,0,0,0,0,-14,0,0,0,0,0,0,14,15,
0,-15,0]
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