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| SN (The Structural Number (SN) represents the overall structural requirement needed to sustain the design’s traffic loadings. - See more at: http://www.pavementinteractive.org/article/structural-number/#sthash.vCkla1N8.dpuf Komron) | |||
| Structural: 8 phrases in 3 subjects |
| Abbreviation | 3 |
| Aeronautics | 4 |
| Agriculture | 1 |