Info : T is actually a triangulation -list of triangles-, in which each index corresponding to the row index of a vertex in another list -a vertices list-, it is a widely used technique used to store and write triangular meshes in mesh processing. Here below the example is a tetrahedron -4 facets-.
I actually realize this problem looks like a lot to my second problem, "Find a common edge" ( https://fr.mathworks.com/matlabcentral/cody/problems/45218-find-a-common-edge ) ...
Remove the air bubbles
Construct an index vector from two input vectors in vectorized fashion
Generate a string like abbcccddddeeeee
frame of the matrix
Find a common vertex
Find neighbor triangle indices
Find edges from a vertex
Remove duplicated triangles
Query every vertices neighbor indices
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