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H2c-ch2-ch2-h2c. H2c=Ch-c=ch2. HC C Ch ch2 = h2c Ch Ch ch2. H2c ch2 ch2 ch2.
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H2c-ch2-ch2-h2c. H2c=Ch-c=ch2. HC C Ch ch2 = h2c Ch Ch ch2. H2c ch2 ch2 ch2. 