Test both directions: all humans are animals; all animals are not humans. Some animals are human. The narrower class is fully contained within the broader class, and the broader class includes further members outside it.
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The two directions of inclusion
Four Relations Between Universal Concepts
Test both directions: all humans are animals; all animals are not humans. Some animals are human. The narrower class is fully contained within the broader class, and the broader class includes further members outside it.