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| samples | percentage of mass increase/% | |
|---|---|---|
| SSP coal | raw SSP | 1.41 |
| hybrid gel-treated SSP | 1.29 | |
| XT coal | raw XT | 1.16 |
| hybrid gel-treated XT | 0.99 | |
| HEXH coal | raw HEXH | 1.71 |
| hybrid gel-treated HEXH | 0.84 |
