The principle illustrated when most people are able to recognize a variety of examples of chairs even though no one category member may have all of the characteristic properties of "chairs" (e. g., most chairs have four legs but not all do)

The principle is Family Resemblance.

Explanation:

Family Resemblance is understood as the idea that objects are similar to each other because a common feature may seem a certain way because of various shared similar features which overlay one another.

This is the case, most individuals tend to be able to recognize a variety of examples of chairs because they tend to have similar features even though, as the example states, not all chairs have 4 legs.

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