freeboundary: indices of elements on the surface?

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"elements" represents tetrahedrons, so it is Nx4 and F on the other hand represents triangles, so it is Mx3. Is there a relationship between "elements" and F at all?
I have a data that is mapped to "elements" so it is in Nx1 format, and I am hoping to find a way to make it in Mx1 format while keeping the same order.
TR = triangulation(elements,nodes);
[F,P] = freeBoundary(TR);

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