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				 Op fire filtering 
 I've only just started dabbling with this feature, and I can see that it is very powerful, but consequently I find it a little overwhelming in how detailed it can be. It has been around for a while now, but I don't remember seeing it discussed much before.
 Therefore I was just wondering if anyone out there was willing to say how they use it? (or if they don't why not)?
 
 Cheers!
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