Blurb::
Primary mappning of top-level variables to sub-model variables
Description::
The \c primary_variable_mapping, \c secondary_variable_mapping, 
\c primary_response_mapping, and \c 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 (\c sub_method_pointer) page. 
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