O- Level=Ordinary Level
OAPEC =Organization of
Arab Petroleum Exporting Countries
OAS = Organization of
American States
OECD= Organization for Economic
Co-operation and Development
OIC = Organization of
Islamic Cooperation.
OPCW = Organization for
the Prohibition of Chemical Weapons.
OPEC =Organization of Petroleum-Exporting
Countries.
OSCE = Organization for
Security and Co-operation in Europe.
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