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Nigerian Major General Sam Victor Malu took over on Thursday as commander of the ECOMOG peacekeeping force in Liberia , two days after the start of the latest ceasefire in the six-year civil war .
 location: Liberia; organization: ECOMOG; else: Nigerian; person: Sam Victor Malu
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, else, organization, person 
Text: {0} 
 Entities: Liberia, ECOMOG, Nigerian, Sam Victor Malu 
Answer:
 location: Liberia; organization: ECOMOG; else: Nigerian; person: Sam Victor Malu