Such agreements grant special customs Customs Union (Preferential Tariff Agreement) partially (Partial Customs-union), FTA (Free Trade Areas) Customs Union (Custom Union) market (Common Market), etc.
Such preferential customs agreement. (Preferential Tariff Agreement) customs union, some (Partial Customs-union) FTA (Free Trade Areas) Customs Union (Custom Union) market share (Common Market) and so on.