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 ) ...
Recurring Cycle Length (Inspired by Project Euler Problem 26)
Specific Element Count
How many days does the cat take to climb out of the hole?
Query every vertices neighbor indices
Remove duplicated vertices
Remove duplicated triangles
Find edges from a vertex
Find neighbor triangle indices
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