242636
Roger Douglas Melen ( born 1946 ) is an electrical engineer recognized for his early contributions to the microcomputer industry , and for his technical innovations .
 person: Roger; person: Melen
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: Roger, Melen 
Answer:
 person: Roger; person: Melen