In this task you need to give reasons to justify the pronoun coreference relations. Each of the provided inputs contains a sentence with a target pronoun and a question about how to justify the coreference between a noun phrase and the target pronoun. Good practices involve the discussion about how the descriptions attached to the targeted pronoun relate to the noun phrase candidate in the question. The reasoning could come from 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 the sentence in natural language.

Q: Sentence: Stretching her back, the woman smiled at the girl.
 Question: Why does the 'her' refer to the woman?

A: Because it seems the stretching and smiling are the same person.
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Q: Sentence: The trophy doesn't fit into the brown suitcase because it is too small.
 Question: Why does the 'it' refer to the suitcase?

A: Because it's more likely for the brown suitcase to be to small in order to fit the trophy inside. IF it was the trophy it wouldn't make sense.
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Q: Sentence: Sam Goodman's biography of the Spartan general Xenophanes conveys a vivid sense of the difficulties he faced in his research.
 Question: Why does the 'he' refer to goodman?

A:
Because general Xenophanes conveys a vivid sense of the difficulties he faced in his research but Sam Goodman's biography of the Spartan.
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