In the following table, indicate whether each statement about regional trade agreements is true or false.

$\backslash$table$[[$Statement$],[$Under regional trade agreements, several countries eliminate tariffs among themselves and lower tariffs against all other$],[$countries$.],[$Regional trade agreements are permitted under GATT.$],[$NAFTA member countries maintain a common schedule of tariffs with countries outside NAFTA.$],[$Products can be shipped duty$-$free between Canada and Mexico only if most of their production occurred within North America.$],[$Rules of origin specify the types of goods that can be shipped duty$-$free within a free trade area.$],[$Rules of origin are not needed in a customs union.$]]$

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