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Molecular dynamics ( MD ) use either quantum mechanics , molecular mechanics or a mixture of both to calculate forces which are then used to solve Newton 's laws of motion to examine the time-dependent behaviour of systems .
 person: Newton
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: Newton 
Answer:
 person: Newton