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  • In-order issue with in-order completion: Issue instructions in the exact order that would be achieved by sequential execution and to write results in that same order.
  • In-order issue with out-of-order completion: Issue instructions in the exact order that would be achieved by sequential execution but allow instructions to run to completion out of order. 
  • Out-of-order issue with out-of-order completion: The processor has a lookahead capability, allowing it to identify independent instructions that can be brought into the execute stage. Instructions are issued with little regard for their original program order. Instructions may also run to completion out of order.

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