Note that the Object to flow can be selected by Style (color) or name. (?)
The Base curve or Base surface must be selected by selecting a spot on the surface, not by color. Same for Target Surface, and curves.

I was wondering how many permutations there would be for a given set of FLOW curves and surfaces, (not counting project, flip, and rigid ).?
Is there some formula?

Given text to be flowed, which is non symmetric, a rectangular Base surface, and a rectangular or cylindrical Target surface,
say some formula like:

? Number of different flow results = (number of Base surface edges) * (number of Target surface edges) * X ?
? # = 4 * 4 = 16 ?

If so, is there any advantage in some way to select one of the orientations by say checkbox, or to have shadows of the results..., rather than trial and
error to get the desired final result?