Barely Significant
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Changes in pore structure of coal caused by coal-to-gas bioconversion.

Sci Rep · 2017 · PMC5476654 · PMID 28630465

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a decreasing trendno p-value reported
However, the permeability of coal has a decreasing trend with an increase in bioconversion time for one in situ briquette molded packed-powder core flooding study 31 .

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.