surface list in the `method' argument
      are called &quot;clauses.&quot; The clauses may appear in any
      order, for example

         DSK/&lt;surface list&gt;/UNPRIORITIZED
         DSK/UNPRIORITIZED/&lt;surface list&gt;
         UNPRIORITIZED/&lt;surface list&gt;/DSK

      The simplest form of the `method' argument specifying use of
      DSK data is one that lacks a surface list, for example:

         'DSK/UNPRIORITIZED'

      For applications in which all loaded DSK data for the target
      bo