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observational : 78 phrases in 26 subjects |
| Advertising | 2 |
| Architecture | 1 |
| Automobiles | 1 |
| Aviation | 2 |
| Business | 4 |
| Commerce | 2 |
| Corporate governance | 1 |
| Demography | 1 |
| Desert science | 4 |
| Earth sciences | 2 |
| Economy | 1 |
| Engineering geology | 6 |
| General | 1 |
| Genetics | 1 |
| Hydroelectric power stations | 1 |
| International trade | 1 |
| Marketing | 2 |
| Mathematics | 2 |
| Metallurgy | 1 |
| Navigation | 1 |
| Oil / petroleum | 3 |
| Space | 6 |
| Sports | 1 |
| Statistics | 1 |
| Technology | 29 |
| United States | 1 |
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