2.3
1. INDIAN OCEAN GYRE 2. ZHENGHE 3. IBN BATTUTA 4. DHOW 5. LATEEN
6. JUNK (SHIP) 7. ASTROLABE 8. STERN-POST RUDDER. 9. SRIVIJAYA 10. DIASPORA
2.4
1. IBN BATTUTA 2. CAMEL SADDLES 3. MAMLUK SULTANATE 4. HAUSA KINGDOMS 5. TIMBUKTU
6. CARAVANSERAI 7. IDJIL SEBKHA 8. CAMEL CARAVAN 9. DJINGUEREBER MOSQUE. 10. TRANS-SAHARAN SLAVE TRADE
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