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H3c-c-ch2-ch3. H3c-c-h2c-c=Ch-ch3. Ch4 c2h2. Ch3 ch3 c2h4.
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H3c-c-ch2-ch3. H3c-c-h2c-c=Ch-ch3. Ch4 c2h2. Ch3 ch3 c2h4. 