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 List processing commands

• CAR - returns the first element of the list.
• CDR - returns everything but the first element of the list.
• CADR - returns the second element of the list.
• CADDR - returns the third element of the list.
• NTH - returns the nth element of the list.
• APPEND - returns any lists passed to it concatenated together as a single list.
• LAST - returns the last element.
• LENGTH - returns the number of elements in the list.
• MEMBER - if the first argument is found to be an element of the list, that element plus the rest of the list is returned.
• REVERSE - returns a copy of a list with the elements in reverse order.
• SUBST - returns a list with every instance of the second argument in the list replaced by the first argument.

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