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How to calculate the facet with respect to the product of simplicial complexes

I began to learn topology with respect to sagemath. I am confused by product function. sage: S = SimplicialComplex([[0,1],[1,2]]) sage: W = SimplicialComplex([[0,1]]) sage: T = S.product(W) T Simplicial complex with 6 vertices and 4 facets why this has 4 facets.Can give me detailed calculation process?

How to calculate the facet with respect to the product of simplicial complexes

I began to learn topology with respect to sagemath. I am confused by product function. function.

sage: S = SimplicialComplex([[0,1],[1,2]])
sage: W = SimplicialComplex([[0,1]])
sage: T = S.product(W)
T
Simplicial complex with 6 vertices and 4 facets

why this has 4 facets.Can give me detailed calculation process?