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appearance as argument number 1

(subclass MouseButton ComputerInputButton)	ComputerInput.kif 192-192	Mouse button is a subclass of computer input button
(documentation MouseButton EnglishLanguage "A ComputerInputButton on a ComputerMouse.")	ComputerInput.kif 193-193	Mouse button is a subclass of computer input button
(typicalPart MouseButton ComputerMouse)	ComputerInput.kif 417-417	A mouse button is typically a part of a computer mouse

appearance as argument number 2

(disjoint ComputerKeyboardKey MouseButton)	ComputerInput.kif 260-260	Computer keyboard key is disjoint from mouse button
(partTypes ComputerMouse MouseButton)	ComputerInput.kif 416-416	Every computer mouse is a part of a mouse button
(termFormat EnglishLanguage MouseButton "mouse button")	domainEnglishFormat.kif 65203-65203	Every computer mouse is a part of a mouse button