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: when was the last time the kansas city chiefs won a superbowl? 
Knowledge Triplets: Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.receiving, m.0791z66
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.receiving, m.0792ywd
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.rushing, m.0791z29
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.receiving, m.0792_8f
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.receiving, m.0792ydd
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.receiving, m.0792ywx
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.receiving, m.079267x
Kansas City Chiefs, sports.sports_championship_event.champion, Super Bowl IV
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.receiving, m.0791t99
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.receiving, m.0792zx3
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.receiving, m.0791tcl
Kansas City Chiefs at Baltimore Ravens, 2009-09-13, american_football.football_game.passing, m.07jqb0m
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.receiving, m.0791z5w
Kansas City Chiefs at San Diego Chargers, 2009-11-29, american_football.football_game.passing, m.096q8tt
Kansas City Chiefs at San Diego Chargers, 2009-11-29, american_football.football_game.rushing, m.096q8vl
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.receiving, m.0792yym
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.season, 2008 NFL season
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.receiving, m.0791z53
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.receiving, m.07943fs
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.receiving, m.0793080
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.receiving, m.0792yff
Kansas City Chiefs at Philadelphia Eagles, 2009-09-27, american_football.football_game.receiving, m.07nn45b
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.rushing, m.07935zc
Kansas City Chiefs at Philadelphia Eagles, 2009-09-27, american_football.football_game.receiving, m.07nn3xm
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.passing, m.0792x92
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.rushing, m.0792yv0
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.receiving, m.0793628
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.rushing, m.0791z1s
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.receiving, m.0791z5h
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.season, 2008 NFL season
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.receiving, m.0791tbf
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.passing, m.0792zrf
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.receiving, m.07943dt
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.rushing, m.0792_6q
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.away_team, Kansas City Chiefs
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.receiving, m.0792zvl
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.rushing, m.079438d
Kansas City Chiefs at Oakland Raiders, 2008-11-30, american_football.football_game.passing, m.079335y
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.rushing, m.0793053
Kansas City Chiefs at Philadelphia Eagles, 2009-09-27, american_football.football_game.passing, m.07nn3t6
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.receiving, m.0792yb1
Kansas City Chiefs at Denver Broncos, 2008-12-07, common.topic.notable_types, NFL Game
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.home_team, Atlanta Falcons
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.passing, m.0791t4c
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.rushing, m.079439k
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.receiving, m.0792_9g
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.receiving, m.079306l
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.passing, m.0791t52
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.receiving, m.079264q
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.rushing, m.0792zt5
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.receiving, m.07930sv
Kansas City Chiefs at Philadelphia Eagles, 2009-09-27, american_football.football_game.receiving, m.07nn427
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.receiving, m.0792xhg
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.receiving, m.0792xjs
Kansas City Chiefs at New York Jets, 2008-10-26, common.topic.notable_for, g.1259hmkj7
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.rushing, m.07935yx
Kansas City Chiefs at Denver Broncos, 2010-01-03, american_football.football_game.receiving, m.09rdl1l
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.receiving, m.0792xh1
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.receiving, m.0792_8s
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.season, 2008 NFL season
Kansas City Chiefs at Denver Broncos, 2010-01-03, common.topic.notable_for, g.1258vfsc0
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.receiving, m.0792yxg
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.rushing, m.0791z31
Kansas City Chiefs at Oakland Raiders, 2008-11-30, american_football.football_game.passing, m.0792_xd
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.receiving, m.07930ry
Kansas City Chiefs at Philadelphia Eagles, 2009-09-27, american_football.football_game.season, 2009 NFL season
Kansas City Chiefs at Washington Redskins, 2009-10-18, common.topic.notable_for, g.12558r4qh
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.receiving, m.0792zyj
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, common.topic.notable_for, g.1256v09dg
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.receiving, m.079361k
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.rushing, m.0792ytn
Kansas City Chiefs at San Diego Chargers, 2009-11-29, american_football.football_game.receiving, m.096q8m2
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.rushing, m.0792yvh
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.receiving, m.0792yxz
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.rushing, m.07935_1
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.rushing, m.079438w
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.rushing, m.0792zs6
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.receiving, m.0792zx_
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.rushing, m.079437z
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.passing, m.0791z0t
Kansas City Chiefs at San Diego Chargers, 2008-11-09, common.topic.notable_for, g.12558r4gb
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.rushing, m.0791z3d
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.receiving, m.07935_z
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.home_team, Denver Broncos
Kansas City Chiefs at Philadelphia Eagles, 2009-09-27, american_football.football_game.passing, m.07nn3_4
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.receiving, m.0791t9v
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.receiving, m.0791z42
Kansas City Chiefs at San Diego Chargers, 2009-11-29, american_football.football_game.passing, m.096q8bb
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.receiving, m.0792xj1
Kansas City Chiefs at Denver Broncos, 2010-01-03, american_football.football_game.passing, m.09rdl2m
Kansas City Chiefs at New England Patriots, 2008-09-07, common.topic.notable_for, g.125dv3s0c
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.receiving, m.079265y
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.passing, m.079262j
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.receiving, m.079266s
Kansas City Chiefs at New England Patriots, 2008-09-07, common.topic.notable_types, NFL Game
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.receiving, m.0792xgm
Kansas City Chiefs at Philadelphia Eagles, 2009-09-27, american_football.football_game.rushing, m.07nn40k
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.receiving, m.079308c
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.receiving, m.07943d7
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.rushing, m.0792y8x
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.receiving, m.0792ycv
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.rushing, m.0791t8f
Kansas City Chiefs at Denver Broncos, 2008-12-07, common.topic.notable_for, g.125965fq7
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.receiving, m.07930rc
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.receiving, m.07943b3
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.receiving, m.079362p
Kansas City Chiefs at Carolina Panthers, 2008-10-05, common.topic.notable_for, g.1259rwjn0
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.receiving, m.0792zwg
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.receiving, m.0792zyy
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.rushing, m.07930q9
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.season, 2008 NFL season
Kansas City Chiefs, american_football.football_team.home_games, Tampa Bay Buccaneers at Kansas City Chiefs, 2008-11-02
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.rushing, m.0791z3r
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.receiving, m.0792yz7
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.receiving, m.0792xft
Kansas City Chiefs at Philadelphia Eagles, 2009-09-27, american_football.football_game.passing, m.07nn3zp
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.away_team, Kansas City Chiefs
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.passing, m.0791y_n
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.rushing, m.0792xd1
Kansas City Chiefs at Oakland Raiders, 2008-11-30, american_football.football_game.season, 2008 NFL season
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.passing, m.0792y71
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.rushing, m.0791t7w
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.receiving, m.079268z
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.away_team, Kansas City Chiefs
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.receiving, m.0792xkp
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.receiving, m.079307f
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.rushing, m.079263b
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.rushing, m.0792_72
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.passing, m.0794379
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.rushing, m.0791z2q
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, common.topic.notable_types, NFL Game
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.rushing, m.0791t5z
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.home_team, New England Patriots
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.rushing, m.0792xb7
Kansas City Chiefs at Philadelphia Eagles, 2009-09-27, common.topic.notable_for, g.1257xtxct
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.rushing, m.0792ztx
Kansas City Chiefs at Oakland Raiders, 2008-11-30, american_football.football_game.receiving, m.079302f
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, common.topic.notable_for, g.1255zw4rc
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.passing, m.0792y7_
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.receiving, m.0791tc0
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.receiving, m.079268j
Kansas City Chiefs, american_football.football_team.away_games, Kansas City Chiefs at Denver Broncos, 2008-12-07
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.receiving, m.0792y9h
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.passing, m.07930pw
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.season, 2008 NFL season
Kansas City Chiefs at San Diego Chargers, 2009-11-29, american_football.football_game.passing, m.096q8c3
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.receiving, m.0792ybk
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.rushing, m.07930r0
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.receiving, m.0792yc3
Kansas City Chiefs at Philadelphia Eagles, 2009-09-27, american_football.football_game.passing, m.07nn3ss
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.receiving, m.079360z
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.rushing, m.0792xf3
Kansas City Chiefs, american_football.football_team.away_games, Kansas City Chiefs at Atlanta Falcons, 2008-09-21
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.receiving, m.07943cn
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.receiving, m.079265c
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.rushing, m.0792y8h
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.passing, m.079303g
Kansas City Chiefs at San Diego Chargers, 2009-11-29, american_football.football_game.passing, m.096q8sx
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.receiving, m.0791z4f
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.home_team, New York Jets
Kansas City Chiefs at Denver Broncos, 2010-01-03, american_football.football_game.receiving, m.09rdl17
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.passing, m.0792_65
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.season, 2008 NFL season
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.rushing, m.0792_7n
Kansas City Chiefs, american_football.football_team.home_games, Denver Broncos at Kansas City Chiefs, 2008-09-28
Kansas City Chiefs at New York Jets, 2008-10-26, common.topic.notable_types, NFL Game
Kansas City Chiefs at Oakland Raiders, 2008-11-30, american_football.football_game.receiving, m.079300b
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.rushing, m.0791t6k
Kansas City Chiefs at Denver Broncos, 2010-01-03, american_football.football_game.receiving, m.09rdl6l
Kansas City Chiefs at Jacksonville Jaguars, 2009-11-08, common.topic.notable_for, g.1256qj9nb
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.receiving, m.079267d
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.receiving, m.07943bz
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.receiving, m.0792zxj
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.receiving, m.0792_93
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.receiving, m.079308_
Kansas City Chiefs, american_football.football_team.away_games, Kansas City Chiefs at New England Patriots, 2008-09-07
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, american_football.football_game.receiving, m.07930tf
Kansas City Chiefs at Oakland Raiders, 2008-11-30, american_football.football_game.receiving, m.0793021
Kansas City Chiefs at Philadelphia Eagles, 2009-09-27, american_football.football_game.receiving, m.07nn3x7
Kansas City Chiefs at Oakland Raiders, 2009-11-15, common.topic.notable_for, g.12550n1s5
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.passing, m.07935y8
Kansas City Chiefs at Oakland Raiders, 2008-11-30, common.topic.notable_for, g.1257rsg3z
Kansas City Chiefs at New York Jets, 2008-10-26, american_football.football_game.receiving, m.0791z4s
Kansas City Chiefs at Cincinnati Bengals, 2008-12-28, common.topic.notable_types, NFL Game
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.away_team, Kansas City Chiefs
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.rushing, m.0792xc5
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.receiving, m.0792xg6
Kansas City Chiefs at San Diego Chargers, 2008-11-09, common.topic.notable_types, NFL Game
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.rushing, m.079304c
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.home_team, San Diego Chargers
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.away_team, Kansas City Chiefs
Kansas City Chiefs at Denver Broncos, 2008-12-07, american_football.football_game.rushing, m.079305s
Kansas City Chiefs at New England Patriots, 2008-09-07, american_football.football_game.rushing, m.0791t8v
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.receiving, m.0793633
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.passing, m.0792ys4
Kansas City Chiefs at San Diego Chargers, 2008-11-09, american_football.football_game.rushing, m.0792_80
Kansas City Chiefs at Atlanta Falcons, 2008-09-21, american_football.football_game.rushing, m.0792ysz

Answer: Super Bowl IV