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Are yams and sweet potatoes the same?

counterexample

[koun-ter-ig-zam-puh l, -zahm-] /ˈkaʊn tər ɪgˌzæm pəl, -ˌzɑm-/
noun
1.
an example that refutes an assertion or claim.
Origin
1955-1960
1955-60; counter- + example
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for counter example

counterexample

/ˈkaʊntərɪɡˌzɑːmpəl/
noun
1.
an example or fact that is inconsistent with a hypothesis and may be used in argument against it
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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