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nine
+
9
☊
nineteen
+
19
☊
ninety
+
90
☊
nine
☊
chín
☊
nine
☊
cửu
☊
nine + 9 ☊ nineteen + 19 ☊ ninety + 90 ☊ nine ☊ 
chín ☊ nine ☊ cửu ☊ nine + 9 ☊ nineteen + 19 ☊ ninety + 90 ☊ nine ☊ chín ☊ nine ☊ cửu ☊