This seems to work for all cases:
https://www.lodev.org/jstumble/?board=rlerrf0lfalfrgaferxfeirfeelferfeeree_8_8
Hmm. If I start with this board and then set bit A and gear bit B to both point to the right, it appears to intercept a blue ball, when I think it should intercept a red ball. But I may be doing something wrong.
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No, it doesn’t show the same output as written in the book.