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 OAPNA  Organization of Asia and Pacific News Agency
 OAU  Organization of African Unity
 OCS  Overseas Communication Service
 OECD  Organization for Economic Cooperation and Development
 OEEC  Organization for European Economic Cooperation
 OGL  Open General License
 OIL l India Limited
 OK  All Correct
 OIGS  On India Government Service
 ONGC  Oil and Natural Gas Commission
 OMSS  Open Market Sale Scheme
 OPEC  Organization of Petroleum Exporting Countries
 OPPI  Organization of Pharmaceutical Producers of India
 OSCE  Organization of European Security Council

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