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Results:
opp. : 1）opposite
opt. : 1）optical 2）optician 3）optics 4）optional
opt : 1）（・・・を）選ぶ《+『for』+『名』》;（・・・するほうを）選ぶ《+『to』 do》
ops : 1）軍事作戦
opper : 1）銅、板、貨、製品
opera : 1）オペラ、歌劇、《ﾗﾃﾝ語》opus の複数形、オペラ劇場
opsin : 1）（生体内物質）オプシン
opine : 1）《『opine』+『that節』》…‘と'考える、思う
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