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H. G. Muller wrote on Tue, Apr 9 08:35 AM UTC in reply to HaruN Y from 01:25 AM:

afs(afzafq)W(afqafz)W

No, that is not it; there is no step on the main orthogonals. The repeating unit involves three steps, not two (afzafqaz), and the repeat of it would thus only visit one of ever three squares in the path. So that you would need three moves to cover the entire path. And the plain W would have to be mentioned separately:

Wafs(afzafqaz)Wafsafz(afqazafz)Wafsafzafq(azafzafq)W

I suppose a bracket notation for this could be a lot simpler

[W?fF(?fzW?fqF?fzF)]

The option to terminate the move at the question marks allows collapsing the three different 'phases' into one.


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