She told him to stop wasting time by coming up with tried and tested ideas and in this way simply re-inventing the ......

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She told him to stop wasting time by coming up with tried and tested ideas and in this way simply re-inventing the ...... (*) circle (*) round (*) curve (*) wheel

This is a companion discussion topic for the original entry at https://english.best/questions/5106,she-told-him-to-stop-wasting-time-by-coming-up-with-tried-and-tested-ideas-and-in-this-way-simply-re-inventing-the-___/