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Epub is comprimed format and You can look what is inside with Total Commander, or any unzip utility. Just rename extension to zip. If You can't find epub editor on Google play, then you can extract from zip(epub) archive txt (HTML) file, make a backup and edit it on the reader in any android editor. Then add new file into archive, rename extension to epub. Difficult way, but a way. I think it will work on 97%.
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