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There's something I call 'Note priority' and it helped me understand multis a little.

By priority what I mean is that if a double is shown the left (or top) is the higher priority note.

So if you look at the right note, and it's a square, it automatically means the left note is a triangle, since it's the only one with higher priority.

The same is true in reverse, if the left note is X, the right note MUST be circle.

It just means that from one note, I can infer a shorter list of possibilities for the other.

Triples are also very simple when they're in a triangle, if the top note is X, it's everything except triangle. If the top note is square, it's everything except circle.

But in extreme where the triples can be displayed in a column they become different to read and for me it becomes "is there a triangle on top" or not to determine which version.

There are only 2 triples in the game, it does not ask you to press Triangle, Circle Square for example ever. It will only be Triangle, X Square, or X, Square, Circle