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14.7 Count Words in defuns in Different Files

In the previous section, we created a function that returns a list of the lengths of each definition in a file. Now, we want to define a function to return a master list of the lengths of the definitions in a list of files.

Working on each of a list of files is a repetitious act, so we can use either a while loop or recursion.

• lengths-list-many-files: Return a list of the lengths of defuns.
• append: Attach one list to another.