I don't know if this will add to, or reduce the confusion, but here's the way I think of it:
When you're looking at the emulsion side, the corner nearest to the notches will be in a clock wise direction from the notches.
The orientation of the film (vertical, horizontal etc) then becomes irrelevant. (In practice, my routine is to hold the film horizontally with the notches lower on the right hand edge.)
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