Search is your friend...you're basically asking for someone else to perform the search for you.
In a nutshell there's no conclusive answer to anti-farm code -
Anet says it doesn't exist, some farmers agree with Anet, others don't.
Some say AoE has no effect on drops, others say kill foes one by one for better drops.
No-one really knows so just play the game instead of wasting time discussing conspiracy theories. The end.
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