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 all the consonants
"Low : High - Low : High - Turn around " -- Create a subindices vector
Unique values without using UNIQUE function
Create an index-powered vector
Find edges from a vertex
Find neighbor triangle indices
Remove duplicated triangles
Find a common vertex
Find a common edge
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