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call-on : 54 phrases in 15 subjects |
| Communications | 19 |
| Economics | 2 |
| Finances | 5 |
| General | 7 |
| Information technology | 2 |
| Labor law | 1 |
| Law | 1 |
| Microsoft | 1 |
| Rail transport | 1 |
| Social science | 3 |
| Technology | 5 |
| Telegraphy | 1 |
| Telephony | 2 |
| Transport | 1 |
| United Nations | 3 |