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На ринг (в четыре угла) вызываются (The ring (in the four corners) are caused by):
Maple
Minitab
COMSOL
&
Mathcad
Три первых для "разогрева" публики, а последний для основного выступления (The first three to "warm up" the audience, and the latter for my keynote speech)
See pls http://seminars.softline.ru/event/8728