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Operation Each of the user companies ( the RTS Users , or Service Providers ) has its own database on the Central Teleswitch Control Unit ( CTCU ) , which is an HP Integrity computer running OpenVMS on IA-64 for reliability and clustering technology to minimise downtime .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None