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  1. or download this
    rules => [
  FOO => sub{print "here!"} # make this rule dependant on whether FOO 
+has a child-tag called BAR?
]
  2. or download this
    rules => [
  FOO => sub{
...
    }
  }
]
  3. or download this
    map{$a=1-$_/10;map{$d=$a;$e=$b=$_/20-2;map{($d,$e)=(2*$d*$e+$a,$e**2
-$d**2+$b);$c=$d**2+$e**2>4?$d=8:_}1..50;print$c}0..59;print$/}0..20