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'
List the area codes in which voters voted both for the contestant 'Tabatha Gehling' and the contestant 'Kelly Clauss'.
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 '
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 = value 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 = value
List the area codes in which voters voted both for the contestant 'Tabatha Gehling ' and the contestant 'Kelly Clauss ' .