In this task you need to indicate the required knowledge type to solve the pronoun coreference relations. Each of the provided inputs contains a sentence with a target pronoun and a question about the knowledge needed to solve the coreference relation between a noun phrase and the target pronoun. The resolution of the pronoun coreference relations typically involves one or multiple following knowledge types about commonsense: First: 'Property', the knowledge about property of objects (e.g., ice is cold). Second: 'Object', the knowledge about objects (e.g., cats have ears). Third: 'Eventuality', the knowledge about eventuality (e.g., 'wake up' happens before 'open eyes'). Forth: 'Spatial', the knowledge about spatial position (e.g., object at the back can be blocked). Fifth: 'Quantity', the knowledge about numbers (e.g., 2 is smaller than 10). Sixth: all other knowledge if above ones are not suitable. Write one or more correct categories. Output 'Others' if there is no category that fits well. 

Sentence: John couldn't see the stage with Billy in front of him because he is so short. The 'he' refers to john. 
 Question: What is the knowledge type needed to solve this relation?
Spatial

Sentence: I used an old rag to clean the knife, and then I put it in the drawer. The 'it' refers to the knife. 
 Question: What is the knowledge type needed to solve this relation?
Object

Sentence: Archaeologists have concluded that humans lived in Laputa 20,000 years ago. They hunted for evidence on the river banks. The 'They' refers to archaeologists. 
 Question: What is the knowledge type needed to solve this relation?

Property