Help in earning from pixprofit

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Hello guys. Im just wondering if anyone of you know any tips or tricks while earning in pixprofit. I am currently doing the method of creating a group and being a member method so that I won't lose earnings due to falling priority. I also have questions in this matters. 1. When you view captcha that has 2 words and one word is really unreadable. Should I type a guess or should I only type the readable part? 2. How to distinguish between a small letter L (l) and a big letter I ? Same with zero and the letter O.