--/2 and ++/2 are “right to left” associative, x -- [:a] -- [:c] is therefore equivalent to x -- ([:a] -- [:c]).
As [:a] without [:c] is still [:a], only :a gets removed from x then.
--/2 and ++/2 are “right to left” associative, x -- [:a] -- [:c] is therefore equivalent to x -- ([:a] -- [:c]).
As [:a] without [:c] is still [:a], only :a gets removed from x then.
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