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Only a few months later , Karl Schwarzschild found a solution to the Einstein field equations , which describes the gravitational field of a point mass and a spherical mass .
 person: Karl Schwarzschild; person: Einstein
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: Karl Schwarzschild, Einstein 
Answer:
 person: Karl Schwarzschild; person: Einstein