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Herman Chernoff wrote an overview of optimal sequential designs , One specific type of sequential design is the " two-armed bandit " , generalized to the multi-armed bandit , on which early work was done by Herbert Robbins in 1952 .
 person: Herman Chernoff; person: Herbert Robbins
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Herman Chernoff, Herbert Robbins 
Answer:
 person: Herman Chernoff; person: Herbert Robbins