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The Matter of Time ( in Spanish : La materia del tiempo ) is an installation comprising eight pieces of torqued ellipses made of weathering steel ( COR-TEN steel ) , by the US sculptor , Richard Serra .
 person: Richard Serra
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: Richard Serra 
Answer:
 person: Richard Serra