Pedagogic solution is available in position 2 (commented, same as solution 1 but more explicit thus suboptimal).
Remove the polynomials that have positive real elements of their roots.
Twins in a Window
Back to basics 21 - Matrix replicating
Vector Linear sum: (p1-m1)V1+(p2-m2)V2+...(pK-mk)Vk
Find neighbor triangle indices
Find a common vertex
Find edges from a vertex
Query a vertex neighbors
Find a common edge
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