start clip rectangle 0 500 500 1e+03
  start transform 1 0 0 1 0 0
    push group
      push group
        start transform 1 0 0 1 0 0
          start clip glyph 159
            start transform 1 0 0 1 0 0
              solid 128 128 128 102
            end transform
          end clip
        end transform
      pop group mode 3
    pop group mode 3
  end transform
end clip