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FindPattern scans the opcodes and bytes of a certain function and returns the function address. Note that the opcodes or bytes must be a unique one, that is, you must find opcodes or bytes that does not match with the bytes of any other function. The thing, you see in the first parameter are the opcodes and bytes("\xE4\x90...") and the second parameter contains the mask. '?' Means that the opcode has a potential of getting changed after samp update, so FindPattern ignores it while scanning, opposite happens with 'x'.