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(emacs-lisp-intro.info)append

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The `append' Function
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   The `append' function attaches one list to another.  Thus,

     (append '(1 2 3 4) '(5 6 7 8))

produces the list

     (1 2 3 4 5 6 7 8)

   This is exactly how we want to attach two lengths' lists produced by
`lengths-list-file' to each other.  The results contrast with `cons',

     (cons '(1 2 3 4) '(5 6 7 8))

which constructs a new list in which the first argument to `cons'
becomes the first element of the new list:

     ((1 2 3 4) 5 6 7 8)