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The ``relenv create`` command.
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Raised when there is an issue creating a new relenv environment.
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Setup the subparser for the ``create`` command.
:param subparsers: The subparsers object returned from ``add_subparsers``
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Create a relenv environment.
:param name: The name of the environment
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:param arch: The architecture to create the environment for
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:raises CreateException: If there is a problem in creating the relenv environment
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The entrypoint into the ``relenv create`` command.
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