question_subject:
Science
question_exam:
IAS
stats:
0,36,37,9,15,36,13
keywords:
{'explosions': [0, 1, 1, 0], 'gases': [0, 0, 5, 12], 'methane': [0, 0, 0, 5], 'hydrogen': [0, 0, 1, 3], 'oxygen': [3, 0, 1, 0], 'carbon dioxide': [2, 0, 5, 6], 'mixture': [0, 0, 1, 5], 'air': [1, 0, 0, 0], 'occurrence': [1, 0, 2, 5]}