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 is the last time the ravens won a superbowl? 
Knowledge Triplets: Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793g15
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.rushing, m.07p5w_b
Baltimore Ravens at New England Patriots, 2009-10-04, common.topic.notable_for, g.1256xshrh
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.07922_8
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.0793fyl
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.receiving, m.07p5x21
Baltimore Ravens at San Diego Chargers, 2009-09-20, american_football.football_game.receiving, m.07mljql
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.passing, m.08nlc80
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.rushing, m.08nlc8m
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0792207
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.season, 2008 NFL season
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.receiving, m.079215t
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.0792bhs
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.rushing, m.07p5ws_
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.0792bj6
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.home_team, Dallas Cowboys
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.07921hc
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.away_team, Baltimore Ravens
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.season, 2008 NFL season
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.rushing, m.08nlcj8
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlcdp
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.receiving, m.079216h
Baltimore Ravens at San Diego Chargers, 2009-09-20, american_football.football_game.receiving, m.07mljr7
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.receiving, m.0792178
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.receiving, m.07p5wxt
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.07921w0
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.passing, m.0793cc_
2001 AFC Championship Game, sports.sports_championship_event.champion, Baltimore Ravens
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.receiving, m.07p5wz5
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.receiving, m.07p5ww2
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.0792bfk
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.07920pv
Baltimore Ravens at Houston Texans, 2008-11-09, american_football.football_game.passing, m.07921lv
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.079287r
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.receiving, m.0791q6v
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.rushing, m.07922z9
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.rushing, m.079213m
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07928b1
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.079231s
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlcch
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.receiving, m.07p5x1q
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.0793ck3
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.07921hr
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.receiving, m.07p5x1c
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.rushing, m.0793cf1
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.07920r8
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793g0t
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07921k6
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlcf4
Baltimore Ravens at San Diego Chargers, 2009-09-20, american_football.football_game.season, 2009 NFL season
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlcc4
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.0793fy4
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.rushing, m.0791q4l
Baltimore Ravens at San Diego Chargers, 2009-09-20, american_football.football_game.receiving, m.07mljhk
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.rushing, m.07922wf
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.passing, m.0792135
Baltimore Ravens at Pittsburgh Steelers, 2009-12-27, american_football.football_game.passing, m.09kngbj
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.passing, m.07p5wsk
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.receiving, m.079216w
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.receiving, m.07p5wws
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.07920qy
Baltimore Ravens at Indianapolis Colts, 2010-01-16, american_football.football_game.season, 2009 NFL season
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.07921_s
Baltimore Ravens at Indianapolis Colts, 2010-01-16, american_football.football_game.passing, m.09tc5k1
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlcd6
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.receiving, m.07p5x10
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlck8
Baltimore Ravens at New England Patriots, 2010-01-10, american_football.football_game.receiving, m.09rlsdl
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.receiving, m.0791q7j
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793fzj
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlccv
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.season, 2008 NFL season
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.rushing, m.07922x8
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.passing, m.07p5wzx
Baltimore Ravens at San Diego Chargers, 2009-09-20, american_football.football_game.passing, m.07mlj62
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.0792303
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.rushing, m.08nlchg
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.rushing, m.08nlc8z
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.0792898
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.receiving, m.07p5x2j
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.07920sl
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793f_3
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.passing, m.079286c
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.07921ws
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.07920sy
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07921kk
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.07920qk
Baltimore Ravens at Pittsburgh Steelers, 2009-12-27, american_football.football_game.passing, m.09kng64
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.07921j3
Baltimore Ravens at New York Giants, 2008-11-16, common.topic.notable_types, NFL Game
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.rushing, m.07p5x00
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.receiving, m.07p5x0c
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.0793cf_
Baltimore Ravens at New York Giants, 2008-11-16, common.topic.notable_for, g.1256z3vg3
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.0793fxc
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.passing, m.07922vh
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.receiving, m.0791q7x
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.receiving, m.07p5wx3
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.079288x
Baltimore Ravens at San Diego Chargers, 2009-09-20, american_football.football_game.receiving, m.07mljcr
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.07921_4
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.passing, m.08nlcg3
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.season, 2009 NFL season
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.079286v
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793fz1
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.season, 2008 NFL season
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.079220n
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.receiving, m.07p5x2w
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.07922_n
Baltimore Ravens at Houston Texans, 2008-11-09, american_football.football_game.passing, m.07921m9
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.rushing, m.08nlc9g
Baltimore Ravens at Houston Texans, 2008-11-09, american_football.football_game.season, 2008 NFL season
Baltimore Ravens at San Diego Chargers, 2009-09-20, american_football.football_game.passing, m.07mljjv
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.passing, m.07920nz
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.rushing, m.07p5wtq
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.07921x6
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.07921yz
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlcjy
Baltimore Ravens, sports.sports_championship_event.champion, Super Bowl XLVII
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.07921jw
Baltimore Ravens at Dallas Cowboys, 2008-12-20, common.topic.notable_for, g.1255cshr8
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07921kx
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.season, 2008 NFL season
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.passing, m.0792b9p
Baltimore Ravens at Pittsburgh Steelers, 2009-12-27, american_football.football_game.season, 2009 NFL season
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.0792884
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.0793cj6
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlckz
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.passing, m.0792j4h
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.season, 2008 NFL season
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.0792bbk
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.07921xm
Baltimore Ravens at Houston Texans, 2008-11-09, american_football.football_game.rushing, m.07921mr
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.0792bh4
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.rushing, m.0793cff
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.0792877
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.rushing, m.08nlc9z
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.0793cgh
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.receiving, m.07p5wy5
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.receiving, m.07p5wzj
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.rushing, m.07922yx
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07928bn
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.rushing, m.07p5wv1
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.079288k
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.0793fxr
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.rushing, m.08nlcbg
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.passing, m.08nlcgv
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.passing, m.07921v3
Baltimore Ravens at San Diego Chargers, 2009-09-20, american_football.football_game.receiving, m.07mljvq
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.07920s5
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlckm
Baltimore Ravens at San Diego Chargers, 2009-09-20, american_football.football_game.receiving, m.07mljrq
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.07921jh
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.receiving, m.0791q6h
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.rushing, m.07p5wvd
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.07920pf
Baltimore Ravens at San Diego Chargers, 2009-09-20, american_football.football_game.receiving, m.07mljj7
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.07921y1
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.rushing, m.08nlchx
Baltimore Ravens at San Diego Chargers, 2009-09-20, american_football.football_game.passing, m.07mljkv
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.0792bk2
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.0793ch5
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.rushing, m.07p5w_p
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.079230w
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.07921zh
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.receiving, m.0791q75
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.rushing, m.07922y0
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.07920rr
Baltimore Ravens at Indianapolis Colts, 2010-01-16, american_football.football_game.passing, m.09tc5pk
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793g09
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.passing, m.07920zt
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.0792bjl
Baltimore Ravens at Green Bay Packers, 2009-12-07, american_football.football_game.passing, m.098jnth
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlcbt
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.receiving, m.079215f
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.rushing, m.0793cdl
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07921l7
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.season, 2009 NFL season
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.079289p
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.receiving, m.07p5wxg
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.07920q5
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.passing, m.07921gw
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.0793ckm
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.passing, m.0791q2d
Baltimore Ravens at San Diego Chargers, 2009-09-20, american_football.football_game.rushing, m.07mljml
Baltimore Ravens, sports.sports_team.championships, 2001 AFC Championship Game
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.receiving, m.0791q5j
Baltimore Ravens at Houston Texans, 2008-11-09, american_football.football_game.passing, m.0792g7h
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlcfp
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.passing, m.0793fwt
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.07922zr
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.receiving, m.079217p
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.home_team, New York Giants
Baltimore Ravens at San Diego Chargers, 2009-09-20, american_football.football_game.receiving, m.07mljq2
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.receiving, m.07p5wwf
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.0792bg6

Answer: Super Bowl XLVII