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Green Grow the Rushes, O (alternatively "Ho" or "Oh") (also known as "The Twelve Prophets", "The Carol of the Twelve Numbers", "The Teaching Song", "The Dilly Song", or "The Ten Commandments"), is an English folk song (Roud #133). It is sometimes sung as a Christmas carol. It often takes the form of antiphon, where one voice calls and is answered by a chorus. Wikipedia