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  ______   _    _     ____      _____     ______  
 /_____// | || | ||  |  _ \\   |  ___||  /_____// 
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 /_//       `---`    `-` --`   `-----`   /_//     
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Text this: Biogas production from co-digestion of Pennisetum pururem cv. Pakchong 1 grass and layer chicken manure using completely stirred tank