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Produces a ranked list of attributes. Search must have been performed prior
to calling this function. Search is called by this function to complete the
traversal of the the search space. A list of attributes and merits are
returned. The attributes a ranked by the order they are added to the subset
during a forward selection search. Individual merit values reflect the
merit associated with adding the corresponding attribute to the subset;
because of this, merit values may initially increase but then decrease as
the best subset is "passed by" on the way to the far side of the search
space.