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недопустимый символ stresses
comp.	inadmissible char
el.	nonadmissible symbol
IT	inadmissible character; invalid character; nonadmissible character (ssn); excluded character (stachel)
Makarov.	illegal character
progr.	invalid symbol (ssn)
tech.	illegal symbol
недопустимые символы
IT	characters that aren't allowed (Alex_Odeychuk)

недопустимый символ: 6 phrases in 2 subjects

Information technology	3
Programming	3