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I was watching the live stream that NP Carling26 provided us with,you can check it out here-
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I noticed when he got the sleight of hand pro 1 challenge done,I was quick enough to read what it was.
It said 'Get 15 kills using sleight of hand'
Maybe this will apply for all perks? Or be based off the same kind of thing. The kills may be increased in order to achieve sleight of hand pro 2? (That's only if there are 3 versions of the challenge.)