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INPUT_FILE1.TXT #REACTANT #REACTION NO. A 1 ... C 1 A 2 B 2
INPUT_FILE2.TXT #PRODUCT #REACTION NO. F 1 ... L 1 G 2 I 2
reactant: E, product: F reactant: E, product: H ... reactant: A, product: I reactant: B, product: G reactant: B, product: I