This concept and “Theories” name a paper that draws a distinction between different kinds of revisable claims based on their framing written by Wilfrid Sellars. A methodology known as “Oxford philosophy” argues that many philosophers distort and misunderstand this concept in its everyday use. This is the first concept mentioned in the title of a book that categorizes propositions based on whether their verifiability is strong or weak. One interpretation of a (*) thought experiment named for this concept (10[1])says the possibility of misremembering a sensation associated with a symbol on a calendar jeopardizes any criterion for the symbol. “Family resemblance” governs a “game” named after this concept according to Philosophical Investigations. For 10 points, what concept is grouped with truth and logic in the title of a book by A. J. Ayer and names an argument by Ludwig Wittgenstein about its “private” form? ■END■ (0[1])