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| backbone network | |||
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| backbone (network, the top level in a hierarchical network) | |||
| system of engineering communication networks and services | |||
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reseau principal : 18 phrases in 8 subjects |
| Aviation | 3 |
| Communications | 3 |
| Environment | 1 |
| Finances | 1 |
| Life sciences | 2 |
| Telegraphy | 1 |
| Transport | 6 |
| Water resources | 1 |
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