Guys/gals, don't waste your time with random search, random mode etc, there is no such a thing as "random" all events follow a pattern, we as humans have to interfere and change these patterns, by following logic and the power of our minds.
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I still believe that the random mode is more effective than the subtraction that you have been mentioning for a while and you are only looking for a solution where there is none, but I wish you success. Everyone applies their own way. Let's see who can do it first, shall we?