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   10    Too Many Nested BEGIN SEQUENCE/END Blocks

   Too many nested BEGIN SEQUENCE/END blocks have been defined. The
   maximum is 16.

   Note: The usual reason this occurs is a LOOP statement within a BEGIN
   SEQUENCE/END structure like the following:

      DO WHILE <condition>
         <statements>...
         BEGIN SEQUENCE
            <statements>...
            LOOP
         END <statements>...
      ENDDO