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startshape A

rule A
{
  superior {}
  inferior {}
}

rule superior
{
  codigoBarras { }
  superior{ s .99 r .30 b .001 }
}

rule inferior
{
  codigoBarras { }
  inferior { s .99 r -.20 b .001 }
}

rule codigoBarras .99
{
  line { r 90 }
  codigoBarras { x 1 }
}
rule codigoBarras .01
{
}

rule line .9
{
  SQUARE { s .2 }
  line { x .7 }
}
rule line .1
{
}