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The  append Function

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)

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