skos:altLabel | - Colorado
- massacre
- the attack
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- Columbine, Colorado
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- 1999 Columbine High School massacre
- 1999 Columbine massacre
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- 1999 US high school massacre
- Columbine High School massacre#\"1 bleeding to death\"
- April 1999 massacre at Columbine High School
- April 1999 shootings
- April 20, 1999 tragedy at Columbine High School
- Columbine High School Massacre
- Columbine High School Massacre (May 1999)
- Columbine High School Shooting
- Columbine High School Shooting Massacre
- Columbine High School massacre victims
- Columbine High School massacre#The massacre
- Columbine High School massacre#The_massacre
- Columbine High School massacre#Weaponry
- Columbine High School shooters
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- Littleton, Colorado school shooting
- Littleton, Colorado school shootings
- Columbine High School massacre#11:29–11:36 a.m.: Library massacre
- Respect Life
- a 1999 massacre
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- its 1999 massacre
- killed thirteen people at Columbine High School
- massacre at Columbine High School
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- similar, more deadly shooting
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- the Columbine School shooting of 1999
- the Trench Coat Mafia
- the massacre at Columbine High School
- the tragedy
- the tragedy in Littleton.
- tragedy at Columbine
- killed twelve students and one teacher before committing suicide
- Columbine High School massacre#Preliminary activities and intent
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