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служебный символ stresses
gen.	utility character (Александр Рыжов)
data.prot.	service symbol
IT	reserved character (ssn)
sec.sys.	service character
tech.	housekeeping symbol; service digit
служебные символы
telecom.	service digits

служебный символ: 7 phrases in 2 subjects

Communications	3
Mass media	4