Often one wants to build up a list of things
incrementally; this is
usually done using CONS. First, note that for any x,
(CONS x NIL) = (LIST x) :
(CONS 'A NIL) = (A) (CONS '(A) NIL) = ((A))
Second, if LST is a list, then (CONS x LST) will make a new list with x as its first element, followed by the other elements of LST.
(CONS 'A '(B C)) = (A B C) (CONS '(A) '(B C)) = ((A) B C)
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