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| matière opaque (for certain, electromagnetic or particle, radiation) | |||
| substance opaque (for certain, electromagnetic or particle, radiation) | |||
| opaque material: 1 phrase in 1 subject |
| Law | 1 |
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| matière opaque (for certain, electromagnetic or particle, radiation) | |||
| substance opaque (for certain, electromagnetic or particle, radiation) | |||
| opaque material: 1 phrase in 1 subject |
| Law | 1 |