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- Ritmo circadiano 1
- River transport 1
- river transport. 1
- Río Napo 1
- Río Putumayo 1
- Roles de las Fuerzas Armadas, Relevancia de las Fuerzas Armadas, Independencia, Soberanía, Integridad Territorial. 1
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- Roles of Armed Forces, Relevance of Armed Forces, Independence, Sovereignty, Territorial Integrity. 1
- Roles Operacionales y Acciones de Rusia en Crimea. 1
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- Russo-japanese war 1
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- San Lorenzo Island, national defense and security, employment possibilities. 1
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- Science and technology, artillery, artillery ammunition 1
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