Assertion: anaphora | /r/CapableOf | present challenge
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Source sentences:
text: Anaphora is an important concept for different reasons and on different levels: first, anaphora indicates how discourse is constructed and maintained; second, anaphora binds different syntactical elements together at the level of the sentence; third, anaphora presents a challenge to natural language processing in computational linguistics, since the identification of the reference can be difficult; and fourth, anaphora tells some things about how language is understood and processed, which is relevant to fields of linguistics interested in cognitive psychology.