8538
An almost complex manifold is called " complex " if , where is a tensor of type ( 2 , 1 ) related to , called the Nijenhuis tensor ( or sometimes the " torsion " ) .
 person: Nijenhuis
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: Nijenhuis