49950
The 18th century saw the arrival of some notable improvements , first by Poleni with the first fully functional calculating clock and four-operation machine , but these machines were almost always " one of the kind " .
 person: Poleni
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Poleni 
Answer:
 person: Poleni