Which was the son of Mathusala, which was the son of Enoch, which was the son of Jared, which was the son of Maleleel, which was the son of Cainan,

This is a lineage of people: Mathusala's son was Enoch, Enoch's son was Jared, Jared's son was Maleleel, Maleleel's son was Cainan.

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