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| |||
| invariable; unchangeable; unvarying | |||
| bad match; invariant match | |||
| irrevocable; unalterable | |||
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invariable : 9 phrases in 7 subjects |
| Communications | 2 |
| Computer numerical control | 1 |
| Earth sciences | 1 |
| Electronics | 2 |
| Hydrology | 1 |
| Information technology | 1 |
| Life sciences | 1 |