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Half-3C: 1- Parent's half-second-cousin's child. 2- Grandparent's half-first-cousin's grandchild. 3- Great-grandparent's half-sibling's great-grandchild. 4- Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents and one great-great-grandparent in common.
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