nconc
Destructive append
> (setq a '(1 2 3))
(1 2 3)
> (setq b '(4 5 6))
(4 5 6)
> (setq c (nconc a b))
(1 2 3 4 5 6)
> c
(1 2 3 4 5 6)
> b
(4 5 6)
> a
(1 2 3 4 5 6)
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