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I recently three starred a base very similar to this one. But I'm a little worried this one is a little different. I copied the attack I saw in this vid.
http://www.youtube.com/watch?v=ratlMOwXch4&t=16m30s
I am not a pro attacker so think twice!
Just copy the hogs on the north part of the base, do a simple gowiwi on the south portion.
GoWiVa it from below, Hog its top
I would go mass witch below then hog the top