| list | a list |
| n | a non-negative integer, default is 1 |
BUTLAST function returns the argument list copy without N last elements. See LAST.
(butlast '(1 2 3)) => (1 2)
(butlast '(1 2 3) 0) => (1 2 3) (butlast '(1 2 3) 1) => (1 2) (butlast '(1 2 3) 2) => (1) (butlast '(1 2 3) 3) => NIL (butlast '(1 2 3) 4) => NIL