CAR (first element of a list) and CDR (remainder of the list) can be used to step through a list one element at a time:
(SETQ TOP (CAR LST)) or (SETQ TOP (POP LST)) (SETQ LST (CDR LST))
Such loops are so frequently used that a macro is provided for them:
(DOLIST (var list) code)will bind var to successive elements of list and execute code for each element.
(DOLIST (NAME NAMELIST) (PRINT (SUBST NAME 'TARGET '(DEAR MR TARGET))) )
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