Both inclusion and partial overlap have shared members. The decisive distinction is whether all members of either class lie in the other. Humans are fully within animals, giving absolute inclusion. White and animal each have members outside the other, giving partial overlap.
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Strict inclusion versus partial overlap
Four Relations Between Universal Concepts
Both inclusion and partial overlap have shared members. The decisive distinction is whether all members of either class lie in the other. Humans are fully within animals, giving absolute inclusion. White and animal each have members outside the other, giving partial overlap.