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By asking me to define a chair to include beanbag chairs but not stools, you assume that I know the difference between beanbag chairs and stools. I cannot define 'chair' in such a way without knowledge of what a beanbag or stool are. Since beanbags and stools have different meanings for me, a precise definition is unimportant. If I understand what you're asking me, then there are preconceived notions of what a stool, beanbag, or chair already is.

Furthermore, defining a chair to exclude stools could be similar to defining mammals to exclude cats. How do you define silverware to include Krazy Straws, but exlude salad forks?
If you know what Krazy Straws and salad forks are, no further definition is required.

Beren