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 2013 coach of the team whose mascot is Sir Purr? 
Knowledge Triplets: m.075fhpm, sports.sports_team_season_record.team, Carolina Panthers
m.07ndw9j, base.ontologies.ontology_instance_mapping.freebase_topic, Carolina Panthers
Sir Purr, common.topic.notable_for, g.12567d_2n
m.0z6b598, award.award_nomination.award_nominee, Carolina Panthers
Mascot, freebase.type_profile.strict_included_types, Topic
Kansas City Chiefs at Carolina Panthers, 2008-10-05, american_football.football_game.home_team, Carolina Panthers
Carolina Panthers, sports.sports_team.venue, m.0pbzfw4
Carolina Panthers, tv.tv_actor.guest_roles, m.0gfysdf
m.075fhnw, sports.sports_team_season_record.team, Carolina Panthers
Carolina Panthers, sports.professional_sports_team.draft_picks, m.05bj8xw
Team, type.property.schema, Mascot
m.05cdl6p, sports.sports_league_draft_pick.team, Carolina Panthers
Carolina Panthers, sports.professional_sports_team.draft_picks, m.05bj8x3
Carolina Panthers, american_football.football_team.home_games, Denver Broncos at Carolina Panthers, 2008-12-14
Carolina Panthers, sports.sports_team.season_record, m.075fhq3
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers at Minnesota Vikings, 2008-09-21, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers at New York Jets, 2009-11-29, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers, sports.sports_team.championships, 2004 NFC Championship Game
Carolina Panthers, american_football.football_team.home_games, Tampa Bay Buccaneers at Carolina Panthers, 2008-12-08
Carolina Panthers, american_football.football_team.home_games, Detroit Lions at Carolina Panthers, 2008-11-16
Carolina Panthers, common.topic.notable_types, Professional Sports Team
Joyce Farms, business.business_operation.major_customer, Carolina Panthers
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.away_team, Carolina Panthers
m.075fhn3, sports.sports_team_season_record.team, Carolina Panthers
Carolina Panthers, sports.professional_sports_team.draft_picks, m.05bv59w
Joyce Farms, business.business_operation.major_customer, Bank of America Stadium
m.0gg1r6y, tv.tv_guest_role.actor, Carolina Panthers
m.0j81th4, american_football.football_historical_coach_position.team, Carolina Panthers
Carolina Panthers, sports.sports_team.colors, White
Sir-Purr.jpg, common.image.appears_in_topic_gallery, Sir Purr
m.075fhqc, sports.sports_team_season_record.team, Carolina Panthers
Carolina Panthers, sports.sports_team.season_record, m.075fhpw
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Oakland Raiders, 2008-11-09
m.075fhnm, sports.sports_team_season_record.team, Carolina Panthers
Carolina Panthers, american_football.football_team.current_head_coach, Ron Rivera
Mascot, type.type.properties, Team
Mascot, type.type.domain, Sports
Carolina Panthers, american_football.football_team.home_games, Chicago Bears at Carolina Panthers, 2008-09-14
Carolina Panthers, sports.professional_sports_team.draft_picks, m.010hbtxb
Mascot, freebase.type_profile.published, Published
m.0ggrntb, tv.tv_guest_role.actor, Carolina Panthers
Mascot, type.type.expected_by, sports_team_mascot
Carolina Panthers at Tampa Bay Buccaneers, 2009-10-18, american_football.football_game.away_team, Carolina Panthers
Washington Redskins at Carolina Panthers, 2009-10-11, american_football.football_game.home_team, Carolina Panthers
Sports, type.domain.types, Professional Sports Team
Carolina Panthers, sports.professional_sports_team.draft_picks, m.05bv74x
Carolina Panthers, sports.sports_team.season_record, m.075fhnc
Carolina Panthers, sports.professional_sports_team.draft_picks, m.05bv86v
Carolina Panthers, base.ontologies.ontology_instance.equivalent_instances, m.07ndw9j
Topic, freebase.type_profile.published, Published
m.0crt99h, sports.sports_league_participation.team, Carolina Panthers
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers, sports.sports_team.venue, m.0pbzg04
m.0crt4n3, sports.sports_league_participation.team, Carolina Panthers
m.05bj8xw, sports.sports_league_draft_pick.team, Carolina Panthers
Carolina Panthers Helmet, common.image.appears_in_topic_gallery, Carolina Panthers
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Atlanta Falcons, 2009-09-20
m.0z6b492, award.award_honor.award_winner, Carolina Panthers
New Orleans Saints at Carolina Panthers, 2008-10-19, american_football.football_game.home_team, Carolina Panthers
Mascot, freebase.type_profile.equivalent_topic, Mascot
Tampa Bay Buccaneers at Carolina Panthers, 2008-12-08, american_football.football_game.home_team, Carolina Panthers
m.05bv86v, sports.sports_league_draft_pick.team, Carolina Panthers
Minnesota Vikings at Carolina Panthers, 2009-12-20, american_football.football_game.home_team, Carolina Panthers
Bank of America Stadium, sports.sports_facility.home_venue_for, m.0pbzg04
Team, type.property.master_property, Team Mascot
Sir Purr, sports.mascot.team, Carolina Panthers
m.04xg_yl, american_football.football_historical_coach_position.team, Carolina Panthers
Carolina Panthers, sports.professional_sports_team.owner_s, Jerry Richardson
Charlotte, sports.sports_team_location.teams, Carolina Panthers
m.05bv5vc, sports.sports_league_draft_pick.team, Carolina Panthers
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.away_team, Carolina Panthers
Detroit Lions at Carolina Panthers, 2008-11-16, american_football.football_game.home_team, Carolina Panthers
Carolina Panthers, sports.sports_team.league, m.0crtfg9
m.075fhmt, sports.sports_team_season_record.team, Carolina Panthers
m.0pbzg04, sports.team_venue_relationship.team, Carolina Panthers
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at New Orleans Saints, 2008-12-28
m.0422g9r, common.webpage.topic, Carolina Panthers
NFC South, sports.sports_league.teams, m.0crtfg9
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at New York Giants, 2008-12-21
NFC South, sports.sports_league.sport, American football
Bank of America Stadium, location.location.containedby, Charlotte
Carolina Panthers, sports.sports_team.season_record, m.075fhmk
Ron Rivera, american_football.football_coach.current_team_head_coached, Carolina Panthers
Carolina Panthers, american_football.football_team.home_games, Kansas City Chiefs at Carolina Panthers, 2008-10-05
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Dallas Cowboys, 2009-09-28
New Orleans Saints at Carolina Panthers, 2010-01-03, american_football.football_game.home_team, Carolina Panthers
Carolina Panthers, american_football.football_team.historical_coaching_staff, m.04xg_yc
NFC South, american_football.football_division.teams, Carolina Panthers
Arizona Cardinals at Carolina Panthers, 2009-01-10, american_football.football_game.home_team, Carolina Panthers
Carolina Panthers, sports.sports_team.arena_stadium, Bank of America Stadium
National Football Conference, sports.sports_league.sport, American football
Carolina Panthers, american_football.football_team.home_games, Washington Redskins at Carolina Panthers, 2009-10-11
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers at Green Bay Packers, 2008-11-30, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers, american_football.football_team.home_games, Atlanta Falcons at Carolina Panthers, 2008-09-28
Carolina Panthers, american_football.football_team.home_games, Tampa Bay Buccaneers at Carolina Panthers, 2009-12-06
Carolina Panthers, american_football.football_team.home_games, Minnesota Vikings at Carolina Panthers, 2009-12-20
Team Mascot, type.property.expected_type, Mascot
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 New York Giants, 2009-12-27
Carolina Panthers, american_football.football_team.historical_coaching_staff, m.0j81th4
m.05bv59w, sports.sports_league_draft_pick.team, Carolina Panthers
m.075fhq3, sports.sports_team_season_record.team, Carolina Panthers
Team Mascot, owl#inverseOf, Team
Sir Purr, common.topic.image, Sir-Purr.jpg
Carolina Panthers, tv.tv_actor.guest_roles, m.0gg1r6y
m.0gfxb0c, tv.tv_guest_role.actor, Carolina Panthers
Carolina Panthers, sports.sports_team.fight_song, Sweet Caroline
Carolina Panthers, sports.sports_team.team_mascot, Sir Purr
Carolina Panthers, american_football.football_team.home_games, Arizona Cardinals at Carolina Panthers, 2009-01-10
Carolina Panthers, sports.sports_team.coaches, m.0_3r22s
Charlotte, location.hud_county_place.place, Charlotte
Carolina Panthers, sports.sports_team.season_record, m.075fhm9
Arizona Cardinals at Carolina Panthers, 2008-10-26, american_football.football_game.home_team, Carolina Panthers
Carolina Panthers, sports.sports_team.season_record, m.075fhmt
m.075fhp3, sports.sports_team_season_record.team, Carolina Panthers
Team Mascot, type.property.reverse_property, Team
2004 NFC Championship Game, sports.sports_championship_event.champion, Carolina Panthers
Carolina Panthers at Dallas Cowboys, 2009-09-28, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers, common.topic.webpage, m.0422g9r
m.075fhnc, sports.sports_team_season_record.team, Carolina Panthers
Atlanta Falcons at Carolina Panthers, 2009-11-15, american_football.football_game.home_team, Carolina Panthers
Sports, type.domain.types, Mascot
Carolina Panthers, award.award_winner.awards_won, m.0z6b492
Team, rdf-schema#domain, Mascot
m.05bj8x3, sports.sports_league_draft_pick.team, Carolina Panthers
Sir Purr, common.topic.article, m.03lr5y
Denver Broncos at Carolina Panthers, 2008-12-14, american_football.football_game.home_team, Carolina Panthers
m.0crtfg9, sports.sports_league_participation.league, NFC South
Sir-Purr.jpg, common.image.size, m.0kksz7
Carolina Panthers, sports.sports_team.league, m.0crt4n3
Carolina Panthers, sports.sports_team.colors, Silver
Carolina Panthers, tv.tv_actor.guest_roles, m.0gfxb0c
Carolina Panthers, tv.tv_actor.guest_roles, m.0gfxfdk
Philadelphia Eagles at Carolina Panthers, 2009-09-13, american_football.football_game.home_team, Carolina Panthers
Carolina Panthers, sports.sports_team.season_record, m.075fhqm
Carolina Panthers, sports.sports_team.sport, American football
Carolina Panthers, tv.tv_actor.guest_roles, m.0gfy1hp
Carolina Panthers, sports.sports_team.season_record, m.075fhnm
m.05bv74x, sports.sports_league_draft_pick.team, Carolina Panthers
m.0_3r22s, sports.sports_team_coach_tenure.team, Carolina Panthers
m.075fhpw, sports.sports_team_season_record.team, Carolina Panthers
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at San Diego Chargers, 2008-09-07
Carolina Panthers, sports.sports_team.season_record, m.075fhpm
m.075fhqm, sports.sports_team_season_record.team, Carolina Panthers
Carolina Panthers, american_football.football_team.home_games, Atlanta Falcons at Carolina Panthers, 2009-11-15
m.0gfy1hp, tv.tv_guest_role.actor, Carolina Panthers
Professional Sports Team, freebase.type_hints.included_types, Topic
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at New York Jets, 2009-11-29
m.075fhpc, sports.sports_team_season_record.team, Carolina Panthers
Buffalo Bills at Carolina Panthers, 2009-10-25, american_football.football_game.home_team, Carolina Panthers
m.0pbzfw4, sports.team_venue_relationship.team, Carolina Panthers
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Green Bay Packers, 2008-11-30
m.0gfw_wm, tv.tv_guest_role.actor, Carolina Panthers
m.04xg_yc, american_football.football_historical_coach_position.team, Carolina Panthers
Carolina Panthers, tv.tv_actor.guest_roles, m.0gfzrzz
m.075fhm9, sports.sports_team_season_record.team, Carolina Panthers
Carolina Panthers, common.topic.notable_for, g.1259dwnz3
Carolina Panthers at New Orleans Saints, 2009-11-08, american_football.football_game.away_team, Carolina Panthers
m.075fhmk, sports.sports_team_season_record.team, Carolina Panthers
Sweet Caroline, sports.fight_song.sports_team, Carolina Panthers
National Football Conference, american_football.football_conference.divisions, NFC South
Team Mascot, rdf-schema#range, Mascot
Carolina Panthers, sports.sports_team.season_record, m.075fhnw
Carolina Panthers, tv.tv_actor.guest_roles, m.0gfw_wm
Bank of America Stadium, business.customer.supplier, Joyce Farms
Carolina Panthers, american_football.football_team.home_games, Arizona Cardinals at Carolina Panthers, 2008-10-26
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.away_team, Carolina Panthers
m.0gfxfdk, tv.tv_guest_role.actor, Carolina Panthers
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Tampa Bay Buccaneers, 2009-10-18
Carolina Panthers, american_football.football_team.division, NFC South
Carolina Panthers, american_football.football_team.historical_coaching_staff, m.04xg_yl
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Arizona Cardinals, 2009-11-01
Chicago Bears at Carolina Panthers, 2008-09-14, american_football.football_game.home_team, Carolina Panthers
Miami Dolphins at Carolina Panthers, 2009-11-19, american_football.football_game.home_team, Carolina Panthers
Tampa Bay Buccaneers at Carolina Panthers, 2009-12-06, american_football.football_game.home_team, Carolina Panthers
m.0gfysdf, tv.tv_guest_role.actor, Carolina Panthers
Carolina Panthers at Oakland Raiders, 2008-11-09, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers, award.award_nominee.award_nominations, m.0z6b598
m.010hbtxb, sports.sports_league_draft_pick.team, Carolina Panthers
m.0crtfg9, sports.sports_league_participation.team, Carolina Panthers
Mascot, freebase.type_profile.kind, Title
m.0gfzrzz, tv.tv_guest_role.actor, Carolina Panthers
Sir Purr, sports.sports_team.team_mascot, Carolina Panthers
Carolina Panthers, american_football.football_team.home_games, New Orleans Saints at Carolina Panthers, 2008-10-19
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Atlanta Falcons, 2008-11-23
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at New England Patriots, 2009-12-13
Sir Purr, common.topic.notable_types, Mascot
Carolina Panthers, sports.professional_sports_team.draft_picks, m.05cdl6p
Mascot, freebase.type_hints.included_types, Topic
Carolina Panthers, american_football.football_team.home_games, New Orleans Saints at Carolina Panthers, 2010-01-03
Mascot, common.topic.article, m.02ht4bx
Carolina Panthers, tv.tv_actor.guest_roles, m.0ggrntb
Mascot, type.type.expected_by, Team Mascot
Professional Sports Team, type.type.domain, Sports
Mascot, freebase.documented_object.documentation, m.02ht4bx
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12
NFC South, american_football.football_division.conference, National Football Conference
Carolina Panthers, american_football.football_coach.current_team_head_coached, Ron Rivera
Jerry Richardson, sports.sports_team_owner.teams_owned, Carolina Panthers
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.away_team, Carolina Panthers
National Football Conference, sports.sports_league.teams, m.0crt99h
Carolina Panthers, sports.sports_team.season_record, m.075fhqc
Carolina Panthers, american_football.football_team.conference, National Football Conference
Professional Sports Team, freebase.type_profile.strict_included_types, Topic
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at New Orleans Saints, 2009-11-08
Atlanta Falcons at Carolina Panthers, 2008-09-28, american_football.football_game.home_team, Carolina Panthers
Carolina Panthers, sports.sports_team.season_record, m.075fhp3
Carolina Panthers, sports.sports_team.colors, Blue
National Football Conference, american_football.football_conference.teams, Carolina Panthers
Carolina Panthers, business.customer.supplier, Joyce Farms
Carolina Panthers, american_football.football_team.home_games, Miami Dolphins at Carolina Panthers, 2009-11-19
Carolina Panthers, american_football.football_team.home_games, Buffalo Bills at Carolina Panthers, 2009-10-25
m.0pbzg04, sports.team_venue_relationship.venue, Bank of America Stadium
Carolina Panthers, sports.sports_team.colors, Black
m.0crt99h, sports.sports_league_participation.league, National Football Conference
Carolina Panthers, sports.sports_team.season_record, m.075fhn3
Carolina Panthers, common.topic.image, Carolina Panthers Helmet
Carolina Panthers, common.topic.article, m.01y3n
Carolina Panthers, american_football.football_team.home_games, Philadelphia Eagles at Carolina Panthers, 2009-09-13
Carolina Panthers, sports.sports_team.location, Charlotte
Bank of America Stadium, sports.sports_facility.teams, Carolina Panthers
Carolina Panthers at Arizona Cardinals, 2009-11-01, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers, sports.sports_team.season_record, m.075fhpc
Carolina Panthers, sports.professional_sports_team.draft_picks, m.05bv5vc
Carolina Panthers, sports.sports_team.league, m.0crt99h

Answer: Ron Rivera