remove

• Removes items from a sequence non-destructively, i.e. copies the sequence

> (setq a '(1 2 3 4 3 2 1))

(1 2 3 4 3 2 1)

> (remove 2 a)

(1 3 4 3 1)

> a

(1 2 3 4 3 2 1)

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