145900
Prior to March 2010 , EMPG owned the legacy Riverdeep and Houghton Mifflin Harcourt businesses , which it acquired in 2006 and 2007 , respectively .
 organization: EMPG; organization: Riverdeep; organization: Houghton Mifflin Harcourt
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: EMPG, Riverdeep, Houghton Mifflin Harcourt 
Answer:
 organization: EMPG; organization: Riverdeep; organization: Houghton Mifflin Harcourt