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From the shootings at Columbine High School in Colorado in 1999 to the Sept. 11 terrorist attacks , public grief with all its symbols and trappings has become part of the shared experience , especially on television .
 location contains: Colorado, Columbine High School
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
 Entity Pairs:  Colorado, Columbine High School 
Answer:
 location contains: Colorado, Columbine High School