  mesh
   brick 
    numx 1 
      xblock 1 200. interval 200
    numy 1
      yblock 1 200. interval 200
    numz 1
      zblock 1 5. interval 5
    end
    set assign
       sideset,ilo,30
       sideset,ihi,20
       nodeset,klo,1000
       sideset,klo,3000
       $ nodeset,khi,2000
    end
  end

