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Originally the " little n-cubes operad " or the " little intervals operad " ( initially called little " n " - cubes PROPs ) was defined by Michael Boardman and Rainer Vogt in a similar way , in terms of configurations of disjoint axis-aligned " n " - dimensional hypercubes ( n-dimensional intervals ) inside the unit hypercube .
 person: Michael Boardman; person: Rainer Vogt
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: Michael Boardman; person: Rainer Vogt