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: the rolling stones american tour 1969 is part of what concert tour? 
Knowledge Triplets: The Rolling Stones Tour of Europe '76, music.concert_tour.artist, The Rolling Stones
The Rolling Stones, music.artist.concert_tours, The Rolling Stones US Tour 1978
The Rolling Stones American Tour 1972, music.concert_tour.artist, The Rolling Stones
m.0w490hw, music.concert_performance.artist, The Rolling Stones
United States of America, location.location.events, The Rolling Stones American Tour 1969
The Rolling Stones, music.artist.concert_tours, The Rolling Stones American Tour 1972
The Rolling Stones, music.artist.concert_tours, 14 On Fire
The Rolling Stones' Tour of the Americas '75, music.concert_tour.artist, The Rolling Stones
m.0n4vz3y, music.concert_performance.concert, Altamont Free Concert
m.0n4vz49, music.concert_performance.concert, Altamont Free Concert
Gimme Shelter, imdb.topic.title_id, tt0065780
The Rolling Stones US Tour 1978, music.concert_tour.artist, The Rolling Stones
The Rolling Stones American Tour 1969, time.event.locations, United States of America
The Rolling Stones, base.events.performer.performances, m.0g7l70c
The Rolling Stones, music.artist.concert_tours, The Rolling Stones European Tour 1970
Altamont Free Concert, music.concert.performances, m.0n4vz49
Altamont Free Concert, time.event.end_date, 1969-12-06
The Rolling Stones American Tour 1969, music.concert_tour.concerts, Altamont Free Concert
The Rolling Stones American Tour 1969, time.event.end_date, 1969-11-30
The Rolling Stones American Tour 1981, music.concert_tour.artist, The Rolling Stones
Altamont Free Concert, music.concert.concert_tour, The Rolling Stones American Tour 1969
The Rolling Stones European Tour 1973, music.concert_tour.artist, The Rolling Stones
The Rolling Stones, music.artist.concert_tours, Bridges to Babylon Tour
The Rolling Stones American Tour 1969, music.concert_tour.live_recordings, Get Yer Ya-Ya's Out! The Rolling Stones in Concert
Voodoo Lounge Tour, music.concert_tour.artist, The Rolling Stones
The Rolling Stones European Tour 1967, music.concert_tour.artist, The Rolling Stones
Altamont Free Concert, music.concert.performances, m.0n4vz43
The Rolling Stones, music.artist.concert_tours, Voodoo Lounge Tour
The Rolling Stones, music.artist.concert_tours, The Rolling Stones European Tour 1973
The Rolling Stones, music.artist.concert_tours, Steel Wheels/Urban Jungle Tour
The Rolling Stones, music.artist.concert_tours, The Rolling Stones Tour of Europe '76
A Bigger Bang, music.concert_tour.artist, The Rolling Stones
50 & Counting, music.concert_tour.artist, The Rolling Stones
Altamont Free Concert, music.concert.performances, m.0n4vz4p
Altamont Free Concert, music.concert.concert_video, Gimme Shelter
Licks Tour, music.concert_tour.artist, The Rolling Stones
Gimme Shelter, music.concert_film.concert_tour, The Rolling Stones American Tour 1969
Steel Wheels/Urban Jungle Tour, music.concert_tour.artist, The Rolling Stones
The Rolling Stones, music.artist.concert_tours, The Rolling Stones Pacific Tour 1973
The Rolling Stones, music.artist.concerts, m.0ggncbd
m.0n4vz43, music.concert_performance.concert, Altamont Free Concert
The Rolling Stones, music.artist.concert_tours, The Rolling Stones 2009 Concert Tour
The Rolling Stones, music.artist.concerts, m.0n4vz3y
The Rolling Stones, music.artist.concert_tours, A Bigger Bang
The Rolling Stones European Tour 1982, music.concert_tour.artist, The Rolling Stones
No Security Tour, music.concert_tour.artist, The Rolling Stones
Altamont Free Concert, music.concert.performances, m.0n4vz4h
Gimme Shelter, music.concert_film.concert, Altamont Free Concert
The Rolling Stones, music.artist.concert_tours, The Rolling Stones' Tour of the Americas '75
The Rolling Stones, music.artist.concert_tours, The Rolling Stones European Tour 1982
The Rolling Stones, music.artist.concerts, m.0w490hw
The Rolling Stones, music.artist.concert_tours, The Rolling Stones American Tour 1969
The Rolling Stones, music.artist.concert_tours, The Rolling Stones UK Tour 1971
The Rolling Stones European Tour 1970, music.concert_tour.artist, The Rolling Stones
Altamont Free Concert, music.concert.performances, m.0n4vz3y
The Rolling Stones American Tour 1969, music.concert_tour.artist, The Rolling Stones
The Rolling Stones UK Tour 1971, music.concert_tour.artist, The Rolling Stones
The Rolling Stones, music.artist.concert_tours, The Rolling Stones American Tour 1981
The Rolling Stones, music.artist.concert_tours, Licks Tour
m.0ggncbd, music.concert_performance.artist, The Rolling Stones
The Rolling Stones American Tour 1969, music.concert_tour.concert_films_or_videos, Gimme Shelter
The Rolling Stones American Tour 1969, music.concert.concert_tour, Altamont Free Concert
The Rolling Stones Pacific Tour 1973, music.concert_tour.artist, The Rolling Stones
The Rolling Stones American Tour 1969, time.event.start_date, 1969-11-07
m.0n4vz4h, music.concert_performance.concert, Altamont Free Concert
Get Yer Ya-Ya's Out! The Rolling Stones in Concert, music.live_album.concert_tour, The Rolling Stones American Tour 1969
The Rolling Stones 2009 Concert Tour, music.concert_tour.artist, The Rolling Stones
Altamont Free Concert, time.event.start_date, 1969-12-06
m.0n4vz3y, music.concert_performance.artist, The Rolling Stones
14 On Fire, music.concert_tour.artist, The Rolling Stones
The Rolling Stones, music.artist.concert_tours, No Security Tour
The Rolling Stones, music.artist.concert_tours, The Rolling Stones European Tour 1967
The Rolling Stones, music.artist.concert_tours, 50 & Counting
m.0n4vz4p, music.concert_performance.concert, Altamont Free Concert
Bridges to Babylon Tour, music.concert_tour.artist, The Rolling Stones

Answer: Altamont Free Concert