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| парные струны | |||
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| с парными струнами | |||
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| двухрядная колонна | |||
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double strings : 31 phrases in 10 subjects |
| Construction | 2 |
| Drilling | 2 |
| Electronics | 1 |
| Energy industry | 3 |
| General | 1 |
| Oil / petroleum | 3 |
| Oil and gas technology | 1 |
| Oilfields | 1 |
| Programming | 12 |
| Technology | 5 |