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s=0, j=m−1 → bump i
s=0, j≠m−1 → bump k
0<s<m−1, i=m−1 → bump k
0<s<m−1, i≠m−1 → bump j
s=m−1, i>0 → bump j
s=m−1, i=0 → bump k
Vertex: 000
s = 0
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