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Concentration lectures » disclaimer
English is my second language. I did my best trying to write in English but I can't guarantee I did no mistakes. If you spot any language errors please fell free to drop me a line.
However, if you want to use this material not to learn English, but to learn something about concentrations, your are on the safe side. At the same time I know nobody is perfect, so if you think some corrections are needed, I am ready to discuss it with you.
