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(all (E) (-> (set-t E) (set-t E) bool-t))
Check if the first set includes the second.
(set-include (@set 1 2 3) (@set 1 2)) ;; => true (set-include (@set 1 2) (@set 1 2 3)) ;; => false (set-include (@set 1 2 3) (@set)) ;; => true