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skCrafAll is a special helper used for "+2 to all Crafting skills". It never gets any ranks of its own - all it does is forward its bonuses/penalties to all the real craft skills. For this, you should use a foreach to search through all craft skills, and you're valid if there's at least three ranks in any of them.
The Cooperative Crafting skill from the APG has this same prereq at 1 rank. I'd copy that feat in the editor and copy its prereq over to your feat.
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