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 are the coaches for the oakland raiders? 
Knowledge Triplets: Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.rushing, m.07mlczk
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jk50
m.04ykh_6, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.home_team, Kansas City Chiefs
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.0794mrk
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngtf
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07933k0
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.0794mp2
m.04ykh_l, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.0792yqb
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47tr
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngsd
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.rushing, m.0794mly
Oakland Raiders, american_football.football_team.away_games, Oakland Raiders at San Diego Chargers, 2009-11-01
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlcyf
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.07933zw
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47wp
Oakland Raiders, american_football.football_team.home_games, Denver Broncos at Oakland Raiders, 2009-09-27
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47sc
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykh5s
m.04ykhpk, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47yh
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.0794mpm
Oakland Raiders, american_football.football_team.away_games, Oakland Raiders at Denver Broncos, 2008-11-23
Oakland Raiders, american_football.football_team.away_games, Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28
Oakland Raiders, american_football.football_team.home_games, New England Patriots at Oakland Raiders, 2008-12-14
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.passing, m.0794ml1
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.079316m
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.passing, m.07t47x0
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykh_v
m.0_msn30, sports.sports_team_coach_tenure.team, Oakland Raiders
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.rushing, m.07933xt
Oakland Raiders, american_football.football_team.away_games, Oakland Raiders at San Diego Chargers, 2008-12-04
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07936sp
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jk8w
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngy9
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlc_l
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngxm
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.home_team, New York Giants
Oakland Raiders, american_football.football_team.away_games, Oakland Raiders at Miami Dolphins, 2008-11-16
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.0792yqy
Oakland Raiders, american_football.football_team.away_games, Oakland Raiders at Pittsburgh Steelers, 2009-12-06
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.passing, m.07mlcnf
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.011xd62y
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.079340t
Oakland Raiders, american_football.football_team.away_games, Oakland Raiders at Baltimore Ravens, 2008-10-26
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.passing, m.09kngql
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07933l1
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.rushing, m.09kngrq
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlc_y
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07933ld
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.passing, m.07936qb
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jkbc
m.04ykhzv, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.away_team, Oakland Raiders
Oakland Raiders at San Diego Chargers, 2009-11-01, american_football.football_game.passing, m.07z2l3n
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.home_team, Tampa Bay Buccaneers
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.0792ypk
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykhzb
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mld5d
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jk9p
Oakland Raiders, american_football.football_team.away_games, Oakland Raiders at Houston Texans, 2009-10-04
Oakland Raiders, american_football.football_team.home_games, Atlanta Falcons at Oakland Raiders, 2008-11-02
Oakland Raiders at New Orleans Saints, 2008-10-12, american_football.football_game.home_team, New Orleans Saints
Oakland Raiders, american_football.football_team.home_games, Denver Broncos at Oakland Raiders, 2008-09-08
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jk5s
Oakland Raiders, american_football.football_team.away_games, Oakland Raiders at New York Giants, 2009-10-11
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.079315n
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.away_team, Oakland Raiders
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngxz
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.0j34s8p
m.04ykh_q, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlcsb
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.passing, m.07t47my
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.passing, m.0792ygx
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykhzg
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.07933__
Oakland Raiders, american_football.football_team.division, AFC West
Oakland Raiders, sports.sports_team.sport, American football
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.passing, m.09kngv3
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykhzz
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jkb0
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jk4p
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.07933z8
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.rushing, m.09kngrc
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47zj
Oakland Raiders, american_football.football_team.home_games, Philadelphia Eagles at Oakland Raiders, 2009-10-18
Tony Sparano, american_football.football_coach.current_team_head_coached, Oakland Raiders
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07933kq
Oakland Raiders, american_football.football_team.home_games, New York Jets at Oakland Raiders, 2009-10-25
Oakland Raiders, american_football.football_team.away_games, Oakland Raiders at Cleveland Browns, 2009-12-27
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlcr1
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.rushing, m.09kngw7
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngyn
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykhzv
m.04ykh5s, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47vf
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.rushing, m.07933y7
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jkbq
Oakland Raiders at New Orleans Saints, 2008-10-12, american_football.football_game.receiving, m.0794cx3
Mark Davis, sports.sports_team_owner.teams_owned, Oakland Raiders
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.079317b
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngx8
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jkc1
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykh_2
m.04ykhzg, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders, american_football.football_team.away_games, Oakland Raiders at Dallas Cowboys, 2009-11-26
m.04ykhzb, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders, american_football.football_team.home_games, Carolina Panthers at Oakland Raiders, 2008-11-09
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngts
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47yv
Oakland Raiders, american_football.football_team.home_games, Baltimore Ravens at Oakland Raiders, 2010-01-03
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jk4b
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykhzl
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.passing, m.07mlcys
Oakland Raiders, american_football.football_team.away_games, Oakland Raiders at New Orleans Saints, 2008-10-12
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.passing, m.0792yhc
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlcql
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.rushing, m.0794mlk
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.rushing, m.07mlcpk
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.passing, m.07933fr
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.rushing, m.07mlczx
Oakland Raiders, american_football.football_team.home_games, Kansas City Chiefs at Oakland Raiders, 2009-11-15
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07936tc
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mld50
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykh_b
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.passing, m.098jk6k
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlcrp
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngt2
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47td
Oakland Raiders at New Orleans Saints, 2008-10-12, american_football.football_game.receiving, m.07931xf
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.passing, m.07933dx
Oakland Raiders, american_football.football_team.home_games, San Diego Chargers at Oakland Raiders, 2008-09-28
m.04ykhzq, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.0793419
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykh_g
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.0794ms2
m.04ykh_b, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykhpk
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlcxr
m.04ykhzz, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.rushing, m.07933xd
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngsr
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.away_team, Oakland Raiders
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykh_q
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykhzq
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jk96
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.0792yp2
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.rushing, m.0794mml
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.rushing, m.0792ymr
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.0792yng
Oakland Raiders, american_football.football_team.away_games, Oakland Raiders at Buffalo Bills, 2008-09-21
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlcy2
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykh_6
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47t1
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngzb
Oakland Raiders at New Orleans Saints, 2008-10-12, american_football.football_game.receiving, m.0794czj
Oakland Raiders, american_football.football_team.current_head_coach, Tony Sparano
Oakland Raiders, american_football.football_team.home_games, Cincinnati Bengals at Oakland Raiders, 2009-11-22
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07936t0
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlcsx
Oakland Raiders, american_football.football_team.conference, American Football Conference
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.rushing, m.09kngr0
Oakland Raiders, american_football.football_team.home_games, San Diego Chargers at Oakland Raiders, 2009-09-14
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.away_team, Oakland Raiders
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.0794mnp
Oakland Raiders, american_football.football_team.away_games, Oakland Raiders at Kansas City Chiefs, 2009-09-20
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.0794msm
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.passing, m.07933wd
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.season, 2009 NFL season
Oakland Raiders, american_football.football_team.away_games, Oakland Raiders at Denver Broncos, 2009-12-20
Oakland Raiders at New Orleans Saints, 2008-10-12, american_football.football_game.passing, m.0794cr3
m.04ykhz6, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.passing, m.0792yj9
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07936sb
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.0794mqh
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.rushing, m.09kngvx
Oakland Raiders, sports.sports_team.coaches, m.0_msn30
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07933kc
m.0j34s8p, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.rushing, m.07mlcpx
Oakland Raiders, american_football.football_team.away_games, Oakland Raiders at Kansas City Chiefs, 2008-09-14
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07933ls
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47v2
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.rushing, m.09kngvk
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.rushing, m.09kngs1
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.home_team, Kansas City Chiefs
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngy_
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.home_team, San Diego Chargers
Oakland Raiders, american_football.football_team.home_games, Washington Redskins at Oakland Raiders, 2009-12-13
Oakland Raiders, american_football.football_team.home_games, New York Jets at Oakland Raiders, 2008-10-19
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.passing, m.098jk2j
Oakland Raiders, sports.professional_sports_team.owner_s, Mark Davis
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47zw
Oakland Raiders, american_football.football_team.home_games, Houston Texans at Oakland Raiders, 2008-12-21
m.04ykh_2, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.rushing, m.07933wx
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.passing, m.098jk63
m.04ykh_v, american_football.football_historical_coach_position.team, Oakland Raiders
m.04ykh_g, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at New Orleans Saints, 2008-10-12, american_football.football_game.receiving, m.0794cxw
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.0793166
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykh_l
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngwl
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jk5c
Oakland Raiders, american_football.football_team.home_games, Kansas City Chiefs at Oakland Raiders, 2008-11-30
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mld5r
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.home_team, Pittsburgh Steelers
Oakland Raiders, american_football.football_coach.current_team_head_coached, Tony Sparano
Oakland Raiders at New Orleans Saints, 2008-10-12, american_football.football_game.passing, m.07931rd
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.passing, m.07t47nm
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.passing, m.0793119
m.011xd62y, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykhz6
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngwy
Oakland Raiders, american_football.football_team.home_games, Heidi Game
m.04ykhzl, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.home_team, Cleveland Browns
Oakland Raiders at New Orleans Saints, 2008-10-12, american_football.football_game.receiving, m.0794czz

Answer: Tony Sparano