What are the states of all branch establishments?
SELECT state FROM establishment WHERE main_branch = 'Branch';
SP; RS; SP; CE; TO; MA; MG; MA; SP; RJ; SP; PR; AM; SP; ES; PR; SP; SP; GO; CE; RS; SP; PA; PR; MG; SP; SE; SP; RN; SP; SP; RO; BA; SP; GO; SP; SP; RS; SP; SP; SP; SP; SP; RJ; RJ; SC; SP; CE; RJ; SP; MG; RJ; MG; MG