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When Strachey heard about the Manchester Mark 1 , which had a much bigger memory , he asked his former fellow-student Alan Turing for the manual and transcribed his program into the operation codes of that machine by around October 1951 .
 person: Strachey; person: Alan Turing
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Strachey; person: Alan Turing