Who was the EP winning team when the CP winning team was Dave Clark and the GM winning team was Stuart Northrup?
create table table_29225103_2 (ep_winning_team varchar, cp_winning_team varchar, gm_winning_team varchar, PRIMARY KEY (ep_winning_team))
select ep_winning_team from table_29225103_2 where cp_winning_team = "dave clark" and gm_winning_team = "stuart northrup"