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Therefore , the definition of a theorem in system L is : Examples An example of the proof of a sequent ( Modus Tollendo Tollens in this case ) : An example of the proof of a sequent ( a theorem in this case ) : Each rule of system L has its own requirements for the type of input ( s ) or entry ( es ) that it can accept and has its own way of treating and calculating the assumptions used by its inputs .
 None
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:  
Answer:
 None