pushnew

• Push if it isn’t there already

> (setq a (list 1 (2 3) (4 5)))

(1 (2 3) (4 5))

> (pushnew 9 (second a))

(9 2 3)

> a

(1 (9 2 3) (4 5))

> (pushnew 9 (second a))

(9 2 3)

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