[(= 1) (= null) (= [1 2]) (= (fn []))
 (= 1 1) (= 1 2)
 (= 1 1 1) (= 1 1 2) (= 1 2 1)
 (= 1 2 "2") (= 1 1 2 null)
 (= null null null) (= [1] [1] [1])]