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Don't you think that it's easier and more reliable to solve a problem with experience than with theory when it comes to a situation which can be dealt with by them both. Moreover ,no matter what branches of this theory the fotune tellers used (Xu zi ping's orothers'),the only thing we care about is the facts. And actually ,there're some fotune tellers who can predict things accurately. So for those who had the luck to master some parts of this subject,it is not a lifetime research project.