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* Oh thanks for telling me that Mr.Adam, and I would like to ask you some more questionquestions. I am a chemistry specialist, and I really one want to use PPCHtex macro package for display displaying 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 .Do people have any easier way ways to install context in correct way? I love using context when I read the manual , but it is not easy to operate the whole system of Tex. Hopefully the developers will make a procedure which users can manage the system successfully.