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|competition=June 2015
 
|competition=June 2015
 
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==Coal bed methane==
 
==Coal bed methane==
 
Coal Bed Methane (CBM) is a gas contained in coal layer. This gas is a fraction of coal bed gas (CBG), natural gas that produced from a coal layer. There are some others gasses that also contained in a coal layer, such as Carbon dioxide (CO2), Nitrogen (N2), and water (H2O) (Thomas, 2002)
 
Coal Bed Methane (CBM) is a gas contained in coal layer. This gas is a fraction of coal bed gas (CBG), natural gas that produced from a coal layer. There are some others gasses that also contained in a coal layer, such as Carbon dioxide (CO2), Nitrogen (N2), and water (H2O) (Thomas, 2002)

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