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perforation : 99 phrases in 18 subjects |
| Agriculture | 4 |
| Chemistry | 1 |
| Coal | 11 |
| Commerce | 1 |
| Communications | 10 |
| Cultural studies | 5 |
| Earth sciences | 4 |
| Immigration and citizenship | 1 |
| Industry | 5 |
| Information technology | 26 |
| Labor law | 2 |
| Life sciences | 3 |
| Materials science | 1 |
| Mechanic engineering | 2 |
| Medical | 8 |
| Metallurgy | 4 |
| Natural sciences | 1 |
| Work flow | 10 |
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