Earrings are sufficient to be jewelry, but not necessary (because jewelry could also be rings, necklaces, etc.). Jewelry is necessary to be earrings, but not sufficient (not all jewelry are earrings).
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Am I correct:
subset: earrings
superset: jewelry
Earrings are sufficient to be jewelry, but not necessary (because jewelry could also be rings, necklaces, etc.). Jewelry is necessary to be earrings, but not sufficient (not all jewelry are earrings).