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Results:
once again : 1）もう一度
one man : 1）或る男
once and again : 1）幾度も
once every : 1）ごとに一度
oncostatin : 1）（生体内物質）オンコスタチン
once a week : 1）週に一度
one half : 1）2分の1
one day : 1）或る日
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once again

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