| |||
| class 4/5 system; combined exchange; combined local/toll system; combined local/transit exchange; combined system | |||
|
sistema combinado : 12 phrases in 7 subjects |
| Agriculture | 1 |
| Earth sciences | 1 |
| Electronics | 2 |
| Industry | 1 |
| Information technology | 1 |
| Technology | 1 |
| Transport | 5 |