premise: After she entered the bookshop , she asked for a copy of three books by Hemingway and Steinbeck . 
hypothesis: She boldly marched into a bookstore and asked the salesclerk for a copy each of Hemingway 's The Sun Come Up Again and Throw Away the Gun and Steinbeck 's The Angry Grape . Is there a term for the errors that creep in while translating a passage back into the original tongue ?