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They mix up the answers. And sometimes choose 4 answers from a possible selection of 20.

Ah that makes sense. Thanks

At the very least, they probably mix up the order of the answers. On that basis, you immediately multiply the variants by 4!. I wonder if it would be faster to do that comparison or not. And this ignores any potential background animations or other non-static entities on the screen there might be.

> ethical issues aside

What might they be? It seems to me perfectly ethical to fight back against the heavily stacked odds.