Blurb::
Primary mappning of top-level variables to sub-model variables
Description::
The ``primary_variable_mapping``, ``secondary_variable_mapping``,
``primary_response_mapping``, and ``secondary_response_mapping`` keywords control
how top-level variables and responses are mapped to variables
and responses in the sub-model. Their usage is explained on
the parent keyword ( ``sub_method_pointer``) page.
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