CREATE TABLE votes (contestant_number VARCHAR(255), state VARCHAR(255)); CREATE TABLE contestants (contestant_number VARCHAR(255), contestant_name VARCHAR(255)); CREATE TABLE area_code_state (area_code VARCHAR(255), state VARCHAR(255))
List the area codes in which voters voted both for the contestant 'Tabatha Gehling' and the contestant 'Kelly Clauss'.
    
SQL: SELECT T3.area_code FROM contestants AS T1 JOIN votes AS T2 ON T1.contestant_number = T2.contestant_number JOIN area_code_state AS T3 ON T2.state = T3.state WHERE T1.contestant_name = 'Tabatha Gehling' INTERSECT SELECT T3.area_code FROM contestants AS T1 JOIN votes AS T2 ON T1.contestant_number = T2.contestant_number JOIN area_code_state AS T3 ON T2.state = T3.state WHERE T1.contestant_name = 'Kelly Clauss'