user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: who has coached the minnesota vikings? 
Knowledge Triplets: Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgyv2
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Detroit Lions, 2008-12-07
Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16, american_football.football_game.receiving, m.0794105
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.receiving, m.07ybvh7
Minnesota Vikings, sports.sports_team.sport, American football
m.04xgytq, american_football.football_coach.coaching_history, Bud Grant
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk4k
American football, sports.sport.team_coaches, Leslie Frazier
Minnesota Vikings, american_football.football_team.home_games, Atlanta Falcons at Minnesota Vikings, 2008-12-21
Minnesota Vikings, sports.sports_team.coaches, m.0_msn3k
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk3j
Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16, american_football.football_game.away_team, Minnesota Vikings
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.receiving, m.0793z61
Minnesota Vikings, sports.sports_team.team_mascot, Viktor the Viking
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.receiving, m.07ybvn4
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.0vsc35t
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.0793tcx
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf49
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.receiving, m.07ybvmg
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.away_team, Minnesota Vikings
Minnesota Vikings, american_football.football_team.home_games, San Francisco 49ers at Minnesota Vikings, 2009-09-27
m.0vsc35t, american_football.football_historical_coach_position.team, Minnesota Vikings
Minnesota Vikings at St. Louis Rams, 2009-10-11, american_football.football_game.passing, m.07t485w
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqfh1
m.04xgytz, american_football.football_historical_coach_position.team, Minnesota Vikings
Minnesota Vikings, american_football.football_historical_coach_position.team, m.0vsc3l2
Minnesota Vikings, american_football.football_team.home_games, Detroit Lions at Minnesota Vikings, 2009-11-15
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.receiving, m.0793z6g
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.receiving, m.07ybvgx
Minnesota Vikings at St. Louis Rams, 2009-10-11, american_football.football_game.passing, m.07t485f
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf6m
Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16, american_football.football_game.receiving, m.0794117
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf3x
m.0_5dx9_, american_football.football_historical_coach_position.team, Minnesota Vikings
m.04xgytg, american_football.football_historical_coach_position.coach, Bud Grant
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk3w
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.01142m4k
Minnesota Vikings at St. Louis Rams, 2009-10-11, american_football.football_game.receiving, m.07t482n
Minnesota Vikings at Carolina Panthers, 2009-12-20, american_football.football_game.away_team, Minnesota Vikings
Minnesota Vikings at Carolina Panthers, 2009-12-20, american_football.football_game.receiving, m.09k0g04
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.receiving, m.07ybvkr
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytl
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf1t
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk2v
Minnesota Vikings at Carolina Panthers, 2009-12-20, american_football.football_game.receiving, m.09k0g0h
Minnesota Vikings, sports.professional_sports_team.owner_s, Zygi Wilf
m.04xgytl, american_football.football_historical_coach_position.coach, Les Steckel
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytg
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.home_team, Chicago Bears
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.away_team, Minnesota Vikings
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.passing, m.07jqf7j
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Pittsburgh Steelers, 2009-10-25
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.passing, m.07ybvcc
Minnesota Vikings at St. Louis Rams, 2009-10-11, american_football.football_game.receiving, m.07t4852
Minnesota Vikings at Carolina Panthers, 2009-12-20, american_football.football_game.passing, m.09k0g1w
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.receiving, m.07ybvls
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knjzm
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.receiving, m.07941s6
Minnesota Vikings at St. Louis Rams, 2009-10-11, american_football.football_game.receiving, m.07t4840
m.04xgytv, american_football.football_historical_coach_position.team, Minnesota Vikings
Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16, american_football.football_game.passing, m.07940vx
Minnesota Vikings at Carolina Panthers, 2009-12-20, american_football.football_game.receiving, m.09k0g1j
m.0vsc3l2, american_football.football_coach.coaching_history, Leslie Frazier
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.receiving, m.07ybvmt
Minnesota Vikings at New Orleans Saints, 2008-10-06, american_football.football_game.home_team, New Orleans Saints
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.0793tff
m.04xgytb, american_football.football_historical_coach_position.team, Minnesota Vikings
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Cleveland Browns, 2009-09-13
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytq
Minnesota Vikings, american_football.football_team.current_head_coach, Mike Zimmer
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk24
m.05cvv0z, american_football.football_historical_coach_position.team, Minnesota Vikings
m.0_msn3k, sports.sports_team_coach_tenure.team, Minnesota Vikings
Minnesota Vikings at St. Louis Rams, 2009-10-11, american_football.football_game.passing, m.07t4805
m.0vsc3l2, american_football.football_historical_coach_position.team, Minnesota Vikings
Minnesota Vikings at St. Louis Rams, 2009-10-11, american_football.football_game.home_team, St. Louis Rams
Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16, american_football.football_game.passing, m.0794kxz
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf0r
Minnesota Vikings, american_football.football_team.home_games, Philadelphia Eagles at Minnesota Vikings, 2009-01-04
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.away_team, Minnesota Vikings
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.season, 2009 NFL season
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.079409y
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knj__
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.home_team, Chicago Bears
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.passing, m.07941mn
Minnesota Vikings at St. Louis Rams, 2009-10-11, american_football.football_game.receiving, m.07t48c2
Zygi Wilf, sports.sports_team_owner.teams_owned, Minnesota Vikings
m.011r8ymx, base.schemastaging.team_training_ground_relationship.team, Minnesota Vikings
Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16, american_football.football_game.home_team, Tampa Bay Buccaneers
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqfk7
Minnesota Vikings, american_football.football_historical_coach_position.team, m.04xgyv2
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Chicago Bears, 2008-10-19
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.receiving, m.07ybvnh
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.passing, m.07941m1
Minnesota Vikings, american_football.football_team.home_games, Carolina Panthers at Minnesota Vikings, 2008-09-21
Minnesota Vikings at Detroit Lions, 2009-09-20, american_football.football_game.home_team, Detroit Lions
Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16, american_football.football_game.receiving, m.0794l3l
m.04xgytg, american_football.football_historical_coach_position.team, Minnesota Vikings
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.home_team, Pittsburgh Steelers
m.04xgytb, american_football.football_historical_coach_position.coach, Norm Van Brocklin
Minnesota Vikings, american_football.football_team.current_head_coach, Mike Zimmer
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.079408b
Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16, american_football.football_game.receiving, m.0794l57
Minnesota Vikings at St. Louis Rams, 2009-10-11, american_football.football_game.receiving, m.07t484d
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk2h
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Chicago Bears, 2009-12-28
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.receiving, m.0793z5p
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.receiving, m.07ybvnv
Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16, american_football.football_game.receiving, m.0794l5y
m.04xgytq, american_football.football_historical_coach_position.team, Minnesota Vikings
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqfjk
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.receiving, m.0793z6z
Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16, american_football.football_game.receiving, m.0794123
Minnesota Vikings at Carolina Panthers, 2009-12-20, american_football.football_game.home_team, Carolina Panthers
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.0793tg2
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytq
Minnesota Vikings at Carolina Panthers, 2009-12-20, american_football.football_game.receiving, m.09k0g3b
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.0793td8
m.0_msn3k, sports.sports_team_coach.teams_coached, Joe Woods
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk4x
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.receiving, m.07941vl
Minnesota Vikings, american_football.football_team.home_games, Green Bay Packers at Minnesota Vikings, 2008-11-09
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.07940cr
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqfdt
Minnesota Vikings, american_football.football_historical_coach_position.team, m.01142m4k
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytb
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytg
Minnesota Vikings at St. Louis Rams, 2009-10-11, american_football.football_game.receiving, m.07t4879
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytb
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.receiving, m.07ybvlf
Minnesota Vikings, sports.sports_team.coaches, m.0ztjbtf
m.0ztjbtf, sports.sports_team_coach.teams_coached, Leslie Frazier
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.passing, m.0793z0c
m.01142m4k, american_football.football_historical_coach_position.team, Minnesota Vikings
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.passing, m.09knjy4
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knj_n
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.season, 2009 NFL season
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.05cvv0z
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.passing, m.0793z1t
Minnesota Vikings at Detroit Lions, 2009-09-20, american_football.football_game.receiving, m.07mlfnr
m.04xgytz, american_football.football_coach.coaching_history, Dennis Green
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.receiving, m.07ybvl2
Minnesota Vikings at Detroit Lions, 2009-09-20, american_football.football_game.away_team, Minnesota Vikings
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.season, 2008 NFL season
Minnesota Vikings, sports.sports_team.coaches, m.0_5dxtm
Minnesota Vikings, sports.sports_team.sport, American football
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.passing, m.0793tb8
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytz
Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16, american_football.football_game.receiving, m.0794l5l
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.0vsc35t
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.0793tgt
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.07940bp
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.0793tf0
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.passing, m.09knk0p
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.receiving, m.07ybvhl
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk46
American football, sports.sports_team_coach.sports_coached, Joe Woods
Minnesota Vikings at Carolina Panthers, 2009-12-20, american_football.football_game.receiving, m.09k0fzs
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.away_team, Minnesota Vikings
Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16, american_football.football_game.receiving, m.0794l22
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytz
Minnesota Vikings at Carolina Panthers, 2009-12-20, american_football.football_game.receiving, m.09k0g4c
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.passing, m.07jqdx3
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knjzz
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.passing, m.079406l
Viktor the Viking, sports.mascot.team, Minnesota Vikings
Minnesota Vikings at St. Louis Rams, 2009-10-11, american_football.football_game.receiving, m.07t48b1
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk0b
Minnesota Vikings, sports.sports_team_coach_tenure.team, m.0_msn3k
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Carolina Panthers, 2009-12-20
Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16, american_football.football_game.receiving, m.0794l2k
m.0k14yzr, base.schemastaging.team_training_ground_relationship.team, Minnesota Vikings
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqffb
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.05cvv0z
Mike Zimmer, american_football.football_coach.current_team_head_coached, Minnesota Vikings
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.receiving, m.07ybvgk
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.home_team, Cleveland Browns
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.receiving, m.07ybvm3
m.01142m4k, american_football.football_historical_coach_position.coach, Joe Woods
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf17
Hubert H. Humphrey Metrodome, sports.sports_facility.teams, Minnesota Vikings
Minnesota Vikings, american_football.football_team.home_games, New York Giants at Minnesota Vikings, 2010-01-03
Minnesota Vikings, common.topic.notable_types, Professional Sports Team
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.receiving, m.07ybvg6
Minnesota Vikings, american_football.football_team.home_games, Chicago Bears at Minnesota Vikings, 2008-11-30
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.receiving, m.07ybvfw
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.0794099
Minnesota Vikings at Carolina Panthers, 2009-12-20, american_football.football_game.receiving, m.09k0g15
Minnesota Vikings at Tennessee Titans, 2008-09-28, american_football.football_game.home_team, Tennessee Titans
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.07940db
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.0_5dx9_
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytl
m.0_5dxtm, sports.sports_team_coach_tenure.team, Minnesota Vikings
m.04xgytl, american_football.football_historical_coach_position.team, Minnesota Vikings
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.passing, m.07jqf8c
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk35
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at New Orleans Saints, 2008-10-06
Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16, american_football.football_game.receiving, m.079411n
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Tennessee Titans, 2008-09-28
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.home_team, Detroit Lions
Minnesota Vikings, american_football.football_team.conference, National Football Conference
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.0vsc3l2
m.04xgyv2, american_football.football_historical_coach_position.team, Minnesota Vikings
m.0ztjbtf, sports.sports_team_coach_tenure.team, Minnesota Vikings
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.passing, m.07ybvhy
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knj_9
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqfhy
Minnesota Vikings, american_football.football_team.home_games, Chicago Bears at Minnesota Vikings, 2009-11-29
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Detroit Lions, 2009-09-20
m.05cvv0z, american_football.football_historical_coach_position.coach, Mike Tomlin
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.receiving, m.0793z7d
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqfkp
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.receiving, m.0793z53
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.home_team, Minnesota Vikings
Minnesota Vikings, american_football.football_team.home_games, New York Giants at Minnesota Vikings, 2008-12-28
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.receiving, m.07941v4
Minnesota Vikings at Pittsburgh Steelers, 2009-10-25, american_football.football_game.away_team, Minnesota Vikings
m.04xgyv2, american_football.football_historical_coach_position.coach, Mike Tice
Minnesota Vikings at Carolina Panthers, 2009-12-20, american_football.football_game.passing, m.09k0fx8
Minnesota Vikings, sports.sports_team_coach_tenure.team, m.0ztjbtf
Minnesota Vikings at St. Louis Rams, 2009-10-11, common.topic.notable_for, g.125bwx5tt
Minnesota Vikings at Tennessee Titans, 2008-09-28, american_football.football_game.away_team, Minnesota Vikings
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.receiving, m.0793z7x
Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16, american_football.football_game.passing, m.07940vb
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.0793th5
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at St. Louis Rams, 2009-10-11
m.0vsc35t, american_football.football_coach.coaching_history, Brad Childress
Minnesota Vikings at St. Louis Rams, 2009-10-11, american_football.football_game.receiving, m.07t483b
Minnesota Vikings, american_football.football_team.home_games, Detroit Lions at Minnesota Vikings, 2008-10-12
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytv
Minnesota Vikings at Detroit Lions, 2008-12-07, american_football.football_game.receiving, m.07941t4
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf3c
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf2d
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf4w
Minnesota Vikings, american_football.football_team.division, NFC North

Answer: Norm Van Brocklin
Brad Childress
Bud Grant
Dennis Green
Mike Zimmer
Les Steckel
Joe Woods
Mike Tice
Leslie Frazier
Mike Tomlin
Jerry Burns