don't let the removalList in _singleTrove() be None; it's easier for it to be an empty list (which is fine for where that list is used; the None wildcard is checked directly from removalHints)
don't let the removalList in _singleTrove() be None; it's easier for it
to be an empty list (which is fine for where that list is used; the None
wildcard is checked directly from removalHints)


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