The data mostly consists of user-supplied filenames, frequently without proper punctuation.

Insert the proper punctuation marks in the following stanza:

Before sending the invitation they smiled, cut out the C, added the proper punctuation marks, and all was well.

The eyes strain from imagistic short phrases and headily descriptive long lines that roll on without the brakes of proper punctuation.

Dashes, underlinings, and interlineations, are much used by unskillful and careless writers, merely as substitutes for proper punctuation, and a correct, regular mode of expression.

Why not! (Note to Miesha: Proper punctuation in the second sentence should actually be a question mark.)

Use Proper Punctuation Ensure that correct punctuation is used, and do not succumb to the habit of using lowercase letters throughout.