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| unalterable; unchangeable | |||
| fixed; constant; permanent; stuck-at | |||
| bad match; invariant match | |||
| invariable; invariant | |||
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invariable : 14 phrases in 10 subjects |
| Astronomy | 2 |
| Automated equipment | 2 |
| Communications | 2 |
| Computer numerical control | 1 |
| Construction | 2 |
| General | 1 |
| Hydrology | 1 |
| Linguistics | 1 |
| Mathematics | 1 |
| Technology | 1 |