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| cement stone (1) |
| filler material (1) |
| gas (1) |
| gas permeability (1) |
| reservoir (1) |
| sand plug (1) |
| stone strength (1) |
| well (1) |
| cement stone (1) |
| filler material (1) |
| gas (1) |
| gas permeability (1) |
| reservoir (1) |
| sand plug (1) |
| stone strength (1) |
| well (1) |