 But perhaps additional apriori considerations can rule this out (Brown 1995). Suppose that Oscar has the concept of a sofa and knowledgeably applies the concept in a variety of cases. Yet assume he is agnostic on whether the concept applies to broad overstuffed armchairs. Then, if Oscar has no community to settle the matter, EXT may suggest that Oscar’s concept is indeterminate in what it refers to. And that seems odd.