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Ch3cl c2h6. Ch3cl c2h6 реакция. Ch4 ch3cl c2h6. Цепочка c ch4 ch3cl c2h6.
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Ch3cl c2h6. Ch3cl c2h6 реакция. Ch4 ch3cl c2h6. Цепочка c ch4 ch3cl c2h6. 