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* Oh thanks for telling me that Mr.Adam, and I would like to ask you some more question. I am chemistry specialist, and I really one to use PPCHtex macro package for display chemical formulas, But the problem is I could not install context properly on my system, even I have read the construction in Pragma installation manual, do people have any easier way to install context correct way? I love using context when I read the manual but it is not easy to operate the whole system of Tex.