There was a formatting error in the file, while resulted in forced tiny font that could not be changed by the reader*.
THIS ERROR HAS BEEN FIXED, and should be available by Monday, if not sooner, so you may redownload your book and read it in the font size of your desiring.
Though it was not mine, I apologize for the error and the consternation, not to say inconvenience, that it caused.
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*No, it’s no use asking me how it happened; I don’t know.