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 was the latest american football coach that has coached the Minnesota Vikings? 
Knowledge Triplets: Mike Zimmer, american_football.football_coach.coaching_history, m.0_5dx9_
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.0793td8
m.0_5dxtm, sports.sports_team_coach_tenure.team, Minnesota Vikings
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.receiving, m.09rdhqs
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.0793hby
Norm Van Brocklin, american_football.football_coach.coaching_history, m.04xgytb
Joe Woods, sports.sports_team_coach.sports_coached, American football
m.0vsc3l2, american_football.football_historical_coach_position.team, Minnesota Vikings
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.rushing, m.09rdhl_
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.0793hbk
m.0vsc35t, american_football.football_historical_coach_position.coach, Brad Childress
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.rushing, m.0793tc3
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.rushing, m.07942d5
Minnesota Vikings at St. Louis Rams, 2009-10-11, american_football.football_game.passing, m.07t485f
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.07942fb
Jerry Burns, common.topic.notable_types, American football head coach
Brad Childress, american_football.football_coach.coaching_history, m.0vsc35t
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.receiving, m.09rdhnc
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.0vsc35t
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.rushing, m.07jqfct
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgyv2
American football, sports.sport.team_coaches, Mike Zimmer
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytv
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk46
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk24
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.rushing, m.0793h7n
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.receiving, m.09rdhtc
Minnesota Vikings, sports.professional_sports_team.owner_s, Zygi Wilf
Minnesota Vikings at St. Louis Rams, 2009-10-11, american_football.football_game.passing, m.07t4805
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.rushing, m.07jqf00
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.passing, m.07jqf7j
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knj_n
m.05cvv0z, american_football.football_historical_coach_position.coach, Mike Tomlin
m.04xgyv2, american_football.football_historical_coach_position.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.receiving, m.07jqfk7
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk2h
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.0793tf0
Minnesota Vikings, american_football.football_team.home_games, Detroit Lions at Minnesota Vikings, 2009-11-15
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.passing, m.09rdhk5
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf3x
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.rushing, m.0793tch
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.receiving, m.09rdhsp
m.0vsc3l2, american_football.football_historical_coach_position.coach, Leslie Frazier
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.05cvv0z
Minnesota Vikings, american_football.football_team.home_games, Philadelphia Eagles at Minnesota Vikings, 2009-01-04
Minnesota Vikings, sports.sports_team_coach_tenure.team, m.0ztjbtf
m.0_5dx9_, american_football.football_historical_coach_position.coach, Mike Zimmer
m.04xgytq, american_football.football_historical_coach_position.coach, Bud Grant
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.rushing, m.07jqfd7
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.rushing, m.07jqd_d
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.07942k6
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf49
Minnesota Vikings at St. Louis Rams, 2009-10-11, american_football.football_game.passing, m.07t485w
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.receiving, m.09rdhq2
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqffb
m.04xgyv2, american_football.football_historical_coach_position.coach, Mike Tice
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.passing, m.09rdhr3
Minnesota Vikings, american_football.football_team.home_games, Chicago Bears at Minnesota Vikings, 2008-11-30
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.0_5dx9_
Minnesota Vikings, american_football.football_team.current_head_coach, Mike Zimmer
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.home_team, Minnesota Vikings
m.04xgytv, american_football.football_historical_coach_position.coach, Jerry Burns
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knjzz
m.04xgytq, american_football.football_historical_coach_position.team, Minnesota Vikings
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.0793hb4
Mike Zimmer, american_football.football_coach.current_team_head_coached, Minnesota Vikings
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf2d
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Carolina Panthers, 2009-12-20
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.07940cr
m.05cvv0z, 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.09knk3j
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqfjk
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.rushing, m.09rdhl9
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.passing, m.09knk0p
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.0793hfp
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.0793tff
Minnesota Vikings, sports.sports_team.coaches, m.0ztjbtf
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.07942gh
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.07940db
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.rushing, m.09rdhr_
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.away_team, Minnesota Vikings
Mike Tomlin, american_football.football_coach.coaching_history, m.05cvv0z
Mike Tomlin, american_football.football_coach.current_team_head_coached, Pittsburgh Steelers
m.04xgytb, american_football.football_historical_coach_position.team, Minnesota Vikings
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.0793hf2
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.receiving, m.09rdhnq
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.0793hgj
Dennis Green, american_football.football_coach.coaching_history, m.04xgytz
m.04xgytz, american_football.football_historical_coach_position.team, Minnesota Vikings
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.passing, m.07jqdx3
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.receiving, m.09rdhpd
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.0794099
Minnesota Vikings, american_football.football_team.home_games, Carolina Panthers at Minnesota Vikings, 2008-09-21
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk3w
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.rushing, m.09knjz8
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.receiving, m.09rdhqf
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Arizona Cardinals, 2009-12-06
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf17
m.0ztjbtf, sports.sports_team_coach.teams_coached, Leslie Frazier
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.rushing, m.07jqdxk
m.0vsc3l2, american_football.football_historical_coach_position.coach, Leslie Frazier
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.receiving, m.09rdhtq
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.rushing, m.07jqdzl
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.01142m4k
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.receiving, m.09rdhn0
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.rushing, m.09rdhkz
m.04xgytb, american_football.football_historical_coach_position.coach, Norm Van Brocklin
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.receiving, m.09rdhvr
Jerry Burns, american_football.football_coach.coaching_history, m.04xgytv
Minnesota Vikings, american_football.football_team.home_games, New York Giants at Minnesota Vikings, 2010-01-03
m.0vsc35t, american_football.football_historical_coach_position.team, Minnesota Vikings
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.receiving, m.09rdhvd
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf3c
Minnesota Vikings, american_football.football_team.home_games, Green Bay Packers at Minnesota Vikings, 2008-11-09
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.rushing, m.07jqf95
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.07940bp
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.0793hd5
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.passing, m.079428z
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk4x
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.passing, m.09rdhjr
Minnesota Vikings, sports.sports_team.sport, American football
m.04xgytz, american_football.football_historical_coach_position.coach, Dennis Green
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqfhy
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at St. Louis Rams, 2009-10-11
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knj_9
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.07942h8
m.04xgytg, american_football.football_historical_coach_position.coach, Bud Grant
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.rushing, m.07jqfc9
Mike Zimmer, sports.sports_team_coach.sports_coached, American football
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.0793hcd
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.rushing, m.09knk13
m.01142m4k, american_football.football_historical_coach_position.team, Minnesota Vikings
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Chicago Bears, 2009-12-28
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf6m
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.rushing, m.07942dx
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at New Orleans Saints, 2008-10-06
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.passing, m.079406l
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knjzm
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Cleveland Browns, 2009-09-13
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.passing, m.09knjy4
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.rushing, m.0793h6p
American football, sports.sport.team_coaches, Leslie Frazier
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.rushing, m.09knk1t
Minnesota Vikings, american_football.football_team.home_games, Indianapolis Colts at Minnesota Vikings, 2008-09-14
m.0_5dx9_, american_football.football_historical_coach_position.team, Minnesota Vikings
Minnesota Vikings, american_football.football_team.home_games, Atlanta Falcons at Minnesota Vikings, 2008-12-21
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.passing, m.0793tb8
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.07942fr
m.0ztjbtf, sports.sports_team_coach_tenure.team, Minnesota Vikings
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytl
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf1t
Minnesota Vikings, american_football.football_team.home_games, Detroit Lions at Minnesota Vikings, 2008-10-12
Minnesota Vikings, american_football.football_team.conference, National Football Conference
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqfh1
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.rushing, m.09rdhkm
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Pittsburgh Steelers, 2009-10-25
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytq
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.0793th5
American football, sports.sport.team_coaches, Leslie Frazier
Mike Zimmer, common.topic.notable_types, American football head coach
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.rushing, m.0793h8b
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Green Bay Packers, 2008-09-08
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk2v
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.passing, m.09rdhrk
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.rushing, m.09rdhmp
Minnesota Vikings, american_football.football_historical_coach_position.team, m.0vsc3l2
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.rushing, m.07jqf9p
m.0_msn3k, sports.sports_team_coach_tenure.team, Minnesota Vikings
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Detroit Lions, 2008-12-07
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqfkp
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.rushing, m.09rdhln
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.home_team, Minnesota Vikings
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytz
Minnesota Vikings, american_football.football_team.division, NFC North
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Detroit Lions, 2009-09-20
Les Steckel, american_football.football_coach.coaching_history, m.04xgytl
Dennis Green, common.topic.notable_types, American football head coach
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk35
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.rushing, m.09knjyy
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.07942j5
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.0vsc3l2
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf4w
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.rushing, m.09knjyl
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqfdt
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.0793tcx
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.rushing, m.09rdhmb
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.0793hdn
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at New Orleans Saints, 2010-01-24
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytb
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Jacksonville Jaguars, 2008-11-23
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.receiving, m.09rdhv1
m.04xgytg, american_football.football_historical_coach_position.team, Minnesota Vikings
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Green Bay Packers, 2009-11-01
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.rushing, m.0794075
Joe Woods, common.topic.notable_types, American football head coach
m.04xgytv, american_football.football_historical_coach_position.team, Minnesota Vikings
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.rushing, m.07jqfb3
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.0793tgt
American football, sports.sport.team_coaches, Joe Woods
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Arizona Cardinals, 2008-12-14
Minnesota Vikings at Cleveland Browns, 2009-09-13, american_football.football_game.receiving, m.07jqf0r
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.0793tg2
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.receiving, m.09rdht0
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.receiving, m.09rdhp1
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Chicago Bears, 2008-10-19
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.rushing, m.09knk1g
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Tennessee Titans, 2008-09-28
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk4k
Joe Woods, american_football.football_coach.coaching_history, m.01142m4k
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.079408b
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.07942gw
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.rushing, m.07942c4
Minnesota Vikings, american_football.football_team.away_games, Minnesota Vikings at Tampa Bay Buccaneers, 2008-11-16
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.receiving, m.07942g2
Minnesota Vikings, american_football.football_team.home_games, Green Bay Packers at Minnesota Vikings, 2009-10-05
Leslie Frazier, sports.sports_team_coach.sports_coached, American football
Minnesota Vikings at Chicago Bears, 2008-10-19, american_football.football_game.receiving, m.079409y
Mike Tice, american_football.football_coach.coaching_history, m.04xgyv2
Minnesota Vikings, american_football.football_team.home_games, San Francisco 49ers at Minnesota Vikings, 2009-09-27
Les Steckel, common.topic.notable_types, American football head coach
Leslie Frazier, american_football.football_coach.coaching_history, m.0vsc3l2
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.passing, m.0793h5_
m.04xgytl, american_football.football_historical_coach_position.coach, Les Steckel
Minnesota Vikings, american_football.football_team.historical_coaching_staff, m.04xgytg
Minnesota Vikings, american_football.football_team.home_games, Dallas Cowboys at Minnesota Vikings, 2010-01-17
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.receiving, m.09rdhpr
Minnesota Vikings at Chicago Bears, 2009-12-28, american_football.football_game.receiving, m.09knk0b
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.rushing, m.0793h97
New York Giants at Minnesota Vikings, 2010-01-03, american_football.football_game.rushing, m.09rdhsb
Minnesota Vikings, american_football.football_team.home_games, Chicago Bears at Minnesota Vikings, 2009-11-29
Minnesota Vikings, american_football.football_team.home_games, New York Giants at Minnesota Vikings, 2008-12-28
Bud Grant, american_football.football_coach.coaching_history, m.04xgytg
m.01142m4k, american_football.football_historical_coach_position.coach, Joe Woods
New York Giants at Minnesota Vikings, 2008-12-28, american_football.football_game.passing, m.0793h5g
Bud Grant, american_football.football_coach.coaching_history, m.04xgytq

Answer: Leslie Frazier