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Personally, I bought software called Green Screen Wizard Pro for $199, always shoot with my subject 6 feet in front of the green screen, and GSW totally eliminates all green from within hair or even thin material, such as a bridal veil. It has some easy tools to swipe over the subject just in case there's any leakage. I wouldn't even attempt green screen without this software but you may not want to have the additional expenditure.
I assist a photographer who just bought the Green Screen Wizard and it is a tremendous help in removing green from tiny weird places! I love it and think its totally worth the price!