83200
The hydrogen atom is a Kepler problem , since it comprises two charged particles interacting by Coulomb 's law of electrostatics , another inverse square central force .
 person: Kepler; person: Coulomb
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: Kepler, Coulomb 
Answer:
 person: Kepler; person: Coulomb