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104, 136], 'chemical': [41], 'composition': [42], 'which': [43, 74], 'adversely': [44], 'affects': [45], 'efficiency': [47], 'production.': [50], 'Therefore,': [51], 'technical': [53], 'approaches': [54], 'overcome': [56], 'recalcitrance': [57], 'biomass': [59, 95], 'feedstock': [60], 'has': [61], 'been': [62], 'developed': [63], 'remove': [65], 'barriers': [67], 'with': [68, 144], 'help': [70], 'pretreatment': [72, 123], 'methods': [73], 'make': [75], 'cellulose': [76], 'accessible': [78], 'hydrolytic': [81], 'enzymes,': [82], 'secreted': [83], 'by': [84], 'microorganisms,': [86], 'its': [88], 'glucose.': [91], 'Pretreatment': [92], 'lignocellulosic': [94, 134], 'in': [96, 111], 'cost': [97], 'effective': [98], 'manner': [99], 'is': [100], 'a': [101], 'major': [102], 'challenge': [103], 'technology': [106], 'research': [107], 'development.': [109], 'Hence,': [110], 'this': [112], 'review,': [113], 'we': [114], 'have': [115], 'discussed': [116], 'various': [117, 133], 'aspects': [118], 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