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  How can I tell if an expression is optimizable?:

  You can test the level of optimization for any query expression by simply
  calling the m6_IsOptimize() function.  It will return one of the following
  three values.

       Return
       Value    Description

         2      Fully optimizable.  Query condition contains all indexed
                expressions.

         1      Partially optimizable.  Query condition contains at least
                one indexed expressions.

         0      Not optimizable. No index keys found in query condition.
                Query will be turned over to Clipper for default processing.