Ideas from 'Types and Ontology' by Fred Sommers [1963], by Theme Structure
[found in 'Philosophical Logic' (ed/tr Strawson,P.F.) [OUP 1973,0-19-875004-8]].
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7. Existence / E. Categories / 1. Categories
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13127
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Categories can't overlap; they are either disjoint, or inclusive [Westerhoff]
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