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non-statutory service (A non statutory service is one which may or may not be supplied, at the discretion of the the authority concerned.  yahoo.com Alexander Demidov) | |||
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| optional services (услуги, предоставляемые по требованию пользователя ЭВМ или абонента сети связи) | |||
| необязательная услуга: 4 phrases in 2 subjects |
| Computer networks | 2 |
| Programming | 2 |