600
A U . S . intelligence official , speaking on condition of anonymity , said Barzan Ibrahim had been a presidential adviser to Saddam ' s regime since 1998 , but had a shaky relationship with his half brother and was not part of the regime ' s inner circle .
 Barzan Ibrahim: person; regime: entity
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: start position 
  Option: person, entity, place 
Text: {0} 
Answer:
 Barzan Ibrahim: person; regime: entity