Assertion: defeasible reasoning | /r/HasProperty | useful
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Source sentences:
text: Nicholas Asher and his collaborators (Lascarides and Asher 1993, Asher and Lascarides 2003, Vieu, Bras, Asher, and Aurnague 2005, Txurruka and Asher 2008) have argued that defeasible reasoning is useful in unpacking the pragmatics of conversational implicature.