How many different play-by-play announcers also had pregame analysis by Darren Flutie, Eric Tillman and Greg Frers?
create table table_17628022_2 (play_by_play varchar, pregame_analysts varchar, PRIMARY KEY (play_by_play))
select count(play_by_play) from table_17628022_2 where pregame_analysts = "darren flutie, eric tillman and greg frers"