Nine minus four is five., , Fifteen minus five is ten., , Eleven plus five is sixteen., , Sixteen minus eight is eight., , Ten plus three is thirteen., , Ten minus three is seven., , Twelve plus six is eighteen., , Nine plus six is fifteen., , Seven plus eight is fifteen., , Eighteen minus nine is nine., , Fourteen minus seven is seven., , Thirteen minus six is seven., , Twelve minus ten is two., , Eleven minus two is nine., , Twenty minus ten is ten., , Three plus four is seven., , Five plus eight is thirteen, , Seventeen minus nine is eight., , Eighteen minus seven is eleven., , wenty minus five is fifteen., .

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