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 were the head coaches of the Carolina Panthers after the year 1989? 
Knowledge Triplets: Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.passing, m.0794gy8
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.07946xc
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at New York Jets, 2009-11-29
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38bp
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.receiving, m.0794h0q
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.passing, m.09knf30
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.07946wz
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at New York Giants, 2008-12-21
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at New Orleans Saints, 2009-11-08
Carolina Panthers, sports.sports_team.sport, American football
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.passing, m.0793gzh
Carolina Panthers, common.topic.notable_for, g.1259dwnz3
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.0794915
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.07949vx
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.rushing, m.07949x_
Carolina Panthers, american_football.football_team.division, NFC South
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.rushing, m.07948zg
m.04xg_yl, american_football.football_historical_coach_position.team, Carolina Panthers
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.0793h3b
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at New Orleans Saints, 2008-12-28
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079456x
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g38f6
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g389_
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.rushing, m.07949qb
Carolina Panthers, american_football.football_team.historical_coaching_staff, m.04xg_yc
m.0j81th4, american_football.football_historical_coach_position.coach, John Fox
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlg66
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38hz
Carolina Panthers, sports.sports_team_coach_tenure.team, m.0_3r22s
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.receiving, m.0794h2d
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38gl
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.passing, m.07mlg1g
Carolina Panthers at New Orleans Saints, 2009-11-08, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers, common.topic.notable_types, Professional Sports Team
Carolina Panthers at Oakland Raiders, 2008-11-09, american_football.football_game.passing, m.07948jj
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlfxg
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079454s
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.rushing, m.07948_d
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g389n
Carolina Panthers, american_football.football_team.home_games, Atlanta Falcons at Carolina Panthers, 2008-09-28
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.rushing, m.079452d
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.passing, m.07948xb
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.season, 2008 NFL season
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.receiving, m.09knfbs
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.079347v
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.rushing, m.0793g_0
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.079345r
m.0_3r22s, sports.sports_team_coach_tenure.coach, John Fox
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079458x
Carolina Panthers, sports.sports_team.sport, American football
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.home_team, New England Patriots
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.home_team, New Orleans Saints
m.04xg_yc, american_football.football_historical_coach_position.team, Carolina Panthers
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlfyh
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Atlanta Falcons, 2008-11-23
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.0793h2x
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.passing, m.079451x
m.04xg_yl, american_football.football_historical_coach_position.coach, George Seifert
Carolina Panthers, common.topic.image, Carolina Panthers Helmet
Carolina Panthers at New York Giants, 2008-12-21, common.topic.notable_for, g.1258b__jn
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at San Diego Chargers, 2008-09-07
m.04xg_yc, american_football.football_historical_coach_position.coach, Dom Capers
Kansas City Chiefs at Carolina Panthers, 2008-10-05, american_football.football_game.home_team, Carolina Panthers
Tampa Bay Buccaneers at Carolina Panthers, 2008-12-08, american_football.football_game.home_team, Carolina Panthers
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38fx
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38c0
Carolina Panthers at Green Bay Packers, 2008-11-30, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.0793455
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at New York Giants, 2009-12-27
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.079348r
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.receiving, m.0794h1c
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.receiving, m.0794h4m
Carolina Panthers, american_football.football_team.historical_coaching_staff, m.04xg_yl
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.0793h3r
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.season, 2008 NFL season
Carolina Panthers, american_football.football_team.current_head_coach, Ron Rivera
Carolina Panthers, american_football.football_team.home_games, Detroit Lions at Carolina Panthers, 2008-11-16
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.07949v2
Carolina Panthers, sports.sports_team.coaches, m.0_3r22s
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.receiving, m.0794h56
Carolina Panthers, sports.sports_team.team_mascot, Sir Purr
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.0793h2b
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlg5w
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.receiving, m.0794h34
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.passing, m.07947tn
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.07949wd
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlg4v
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.07946xs
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079458k
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.receiving, m.09knfbf
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.home_team, Atlanta Falcons
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.07947_4
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlg3j
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.passing, m.09g38cr
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g38d5
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.rushing, m.079452y
Carolina Panthers, sports.professional_sports_team.owner_s, Jerry Richardson
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.rushing, m.0793h0y
Carolina Panthers, sports.sports_team.league, m.0crt4n3
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlg55
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g38dw
m.0422g9r, common.webpage.topic, Carolina Panthers
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.passing, m.07949pw
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g38dj
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g38fk
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.receiving, m.0794h3n
m.0j81th4, american_football.football_historical_coach_position.team, Carolina Panthers
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g388m
Carolina Panthers at Oakland Raiders, 2008-11-09, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38cc
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.0793h1r
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.rushing, m.079453b
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlg47
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079492k
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.07946yr
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlfxt
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.home_team, New York Giants
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079490b
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Minnesota Vikings, 2008-09-21
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Atlanta Falcons, 2009-09-20
Carolina Panthers, american_football.football_team.home_games, Kansas City Chiefs at Carolina Panthers, 2008-10-05
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.rushing, m.0793h07
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.rushing, m.0794gzw
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.season, 2008 NFL season
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.passing, m.07mlfpf
m.0_3r22s, sports.sports_team_coach_tenure.team, Carolina Panthers
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.rushing, m.07949qr
Carolina Panthers, american_football.football_historical_coach_position.team, m.04xg_yl
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.07946v_
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.07949sz
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.receiving, m.07949zh
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.079348b
Carolina Panthers at New Orleans Saints, 2008-12-28, common.topic.notable_for, g.125bq2bh0
Carolina Panthers, sports.sports_team.league, m.0crt99h
Carolina Panthers, american_football.football_team.home_games, Chicago Bears at Carolina Panthers, 2008-09-14
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.07947ww
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079457x
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079455d
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38bb
American football, sports.sport.team_coaches, John Fox
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.rushing, m.07949yd
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38gy
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.rushing, m.07948ys
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.0794925
Atlanta Falcons at Carolina Panthers, 2008-09-28, american_football.football_game.home_team, Carolina Panthers
Carolina Panthers, sports.sports_team.league, m.0crtfg9
Chicago Bears at Carolina Panthers, 2008-09-14, american_football.football_game.home_team, Carolina Panthers
Carolina Panthers, american_football.football_team.historical_coaching_staff, m.0j81th4
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlfyw
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38hm
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g3899
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.receiving, m.07949_1
Carolina Panthers, common.topic.webpage, m.0422g9r
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.07946zb
Ron Rivera, american_football.football_coach.current_team_head_coached, Carolina Panthers
m.0_3r22s, sports.sports_team_coach_tenure.coach, John Fox
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Dallas Cowboys, 2009-09-28
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g388z
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.passing, m.07949x6
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.passing, m.09g3885
Carolina Panthers, american_football.football_team.home_games, New Orleans Saints at Carolina Panthers, 2008-10-19
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers, american_football.football_team.home_games, Tampa Bay Buccaneers at Carolina Panthers, 2008-12-08
Carolina Panthers at Oakland Raiders, 2008-11-09, american_football.football_game.passing, m.07932ly
Carolina Panthers at Minnesota Vikings, 2008-09-21, american_football.football_game.receiving, m.07947cm
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.0794560
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlg8y
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.0793h43
Carolina Panthers at Minnesota Vikings, 2008-09-21, american_football.football_game.passing, m.0793_8d
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.passing, m.0793421
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.rushing, m.0794g_l
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlfz6
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38g7
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.home_team, Atlanta Falcons
Carolina Panthers at Atlanta Falcons, 2008-11-23, common.topic.notable_for, g.125gpgwjb
Jerry Richardson, sports.sports_team_owner.teams_owned, Carolina Panthers
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlfy4
Carolina Panthers at Atlanta Falcons, 2009-09-20, common.topic.notable_for, g.125cnxp6m
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at New England Patriots, 2009-12-13
Carolina Panthers, american_football.football_historical_coach_position.team, m.04xg_yc
Carolina Panthers, american_football.football_historical_coach_position.team, m.0j81th4
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.0793h4j
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlfx3
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.receiving, m.09knf66
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.passing, m.07946rs
Carolina Panthers at Dallas Cowboys, 2009-09-28, common.topic.notable_for, g.125crtfpw
Carolina Panthers, american_football.football_team.conference, National Football Conference
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38h8
Carolina Panthers at Minnesota Vikings, 2008-09-21, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.07949rz
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.rushing, m.079453_
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Oakland Raiders, 2008-11-09
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.079346z
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.receiving, m.07949yy
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.07947yf
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Green Bay Packers, 2008-11-30
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.rushing, m.0793g_m
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.home_team, New York Giants
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlg5j
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.07948_x
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.receiving, m.0794h45
Carolina Panthers, common.topic.article, m.01y3n
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.07946y5
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.rushing, m.07949rc
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Tampa Bay Buccaneers, 2009-10-18
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079491s
Carolina Panthers at Dallas Cowboys, 2009-09-28, american_football.football_game.away_team, Carolina Panthers

Answer: George Seifert
Dom Capers
John Fox