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In his other work , he collaborated with Raymond Paley on Littlewood–Paley theory in Fourier theory , and with Cyril Offord in combinatorial work on random sums , in developments that opened up fields that are still intensively studied .
 person: Raymond Paley; person: Littlewood–Paley; person: Cyril Offord
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: Raymond Paley; person: Littlewood–Paley; person: Cyril Offord