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| biuro centralne | |||
| centrala obsługująca lokalną pętlę abonencką | |||
| centrum komutacyjne | |||
| English thesaurus | |||
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| CO (Telephony) | |||
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| CO (Alex Lilo) | |||
| central office: 14 phrases in 9 subjects |
| Construction | 1 |
| Criminal law | 1 |
| Finances | 1 |
| General | 5 |
| Law | 1 |
| Medical | 1 |
| Statistics | 1 |
| Transport | 1 |
| United Nations | 2 |