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  <brush>
    variable_0_15 0 15 10 50 70
  </brush>
  <brush>
    constant_10 10 10 10 50 70
  </brush>
  <brush>
    constant_15 15 15 10 50 70
  </brush>
   <brush>
    airbrush_20_100 20 100 100 20 30
  </brush>
  <brush>
    ink_1_15 1 15 70 90 100
  </brush>
  <brush>
    pencil_1_10 1 10 70 80 30 
  </brush>
</brushes>