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The reason mostly for duplicate spells is either unused test versions or spells specifically tuned for different mobs to cast. Remember, the spell database contains everything any entity can do in addition to quest/area triggers. They don't purge the database often. I've only observed this happen once in the 10 years I've been here. Blizzard has only done this when they reorganized it after removing the spell ranks.
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WoWInterface AddOns
"All I want is a pretty girl, a decent meal, and the right to shoot lightning at fools."
-Anders (Dragon Age: Origins - Awakening)
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