Only in some calculations that I came across.
Its a complicated formulation that gets knocked down to 5 dimensions
which should more or less just be called parameters.
I've never heard of 12 only 10, 11, or the ever comical 26. The fact is, there's only 3 and a lot of energy that does a lot of things. We need to
work in this context before we make our ideas so complicated, we don't even know what proves them and what refutes them.