If foldr f z list replaces (:) with f and z with [] in list, then clearly, \x y -> foldr (:) y x replaces (:) with (:) and [] with y in x.
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If foldr f z list replaces (:) with f and z with [] in list, then clearly, \x y -> foldr (:) y x replaces (:) with (:) and [] with y in x.
