2163
This topic was further developed in the 1930 s by Alonzo Church and Alan Turing , who on the one hand gave two independent but equivalent definitions of computability , and on the other gave concrete examples for undecidable questions .
 person: Alonzo Church; person: Alan Turing
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: Alonzo Church, Alan Turing 
Answer:
 person: Alonzo Church; person: Alan Turing