   mesh
   brick
    numz 1
      zblock 1 10.0 interval 6
    numx 3 initial radius 10.
      xblock 1 2. interval 12
      xblock 2 5. interval 6
      xblock 3 5. interval 12
    numy 2
      yblock 1 18. interval 18
      yblock 2 18. interval 18
    end
   set assign
      block sideset, klo, 11 4
      block sideset, khi, 12 4
      block sideset, klo, 21 5
      block sideset, khi, 22 5
      block sideset, klo, 31 6
      block sideset, khi, 32 6
        sideset,ilo,30
        sideset,ihi,20
    end
  end

