A white horse shows overlap, but that fact alone does not distinguish equality, inclusion, and partial overlap. You also need an animal that is not white and a white object that is not an animal. These exclusive examples establish partial overlap.
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Why one common example is insufficient
Four Relations Between Universal Concepts
A white horse shows overlap, but that fact alone does not distinguish equality, inclusion, and partial overlap. You also need an animal that is not white and a white object that is not an animal. These exclusive examples establish partial overlap.