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Suppose B1, B2, B3, B4 are consecutive blocks and we are now processing the end of the cycle containing B4. * If B4 is justified using source B3, then B3 is finalized. * If B4 is justified using source B2, and B3 has been justified, then B2 is finalized. * If B3 is justified using source B1, and B1 has been justified, then B1 is finalized.