LENGTH
======

syntax: (length <sequence>)

        ==> <number>

This function returns the length of a sequence. If
this sequence is a vector with a fill pointer, then
the active length will be returned.

example:       >(setq computer '("cpu" "ram"
                                 "harddisk" "floppy"))
               ("cpu" "ram" "harddisk" "floppy")
               >(length computer)
               4