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It was formed in 2001 from the former City and Guilds College and the Royal School of Mines - two of the three original ' Constituent Colleges ' of Imperial College when the latter was formed in 1907 .
 City and Guilds College, Royal School of Mines, Imperial
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 City and Guilds College, Royal School of Mines, Imperial