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Merchant marine -- Shipping -- 18 Training of 12 Merchant mariners -- 11 Officers -- 9 Safety measures 8 Security measures 7 more ... Ships -- 6 Certification 5 Harbors -- 5 Study and teaching 4 Watch duty 4 History -- 3 Navigation -- 3 Safety measures -- 3 Safety regulations 3 Security measures -- 3 Study and teaching (Higher) 3 English language -- 2 Evaluation -- 2 Handbooks, manuals, etc 2 International trade -- 2 Law and legislation 2 Management 2 Merchant marine 2 National security -- 2 Naval art and science -- 2 Navigation 2 Piracy -- 2 Seamanship -- 2 less ...