(A) H2, CmHn & CO2
(B) CO, H2 & CH4
(C) CO2, O2 & CO
(D) N2, H2 & CO2
(A) H2, CmHn & CO2
(B) CO, H2 & CH4
(C) CO2, O2 & CO
(D) N2, H2 & CO2
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