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wow that like looking for a needle in a hayfield (i know its haystack)
they look like alot of the 100000000000000000000000000 brush sets i have seen on the net....more than likely it a random set he used....and the fact he is painting under the render and you can not really see the look of the brush it doesnt make it any easier.
i would say go a google, yahoo, etc search for his name and abstract brush or something to see if maybe he actually made them for is just using someone elses
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