H2c c ch ch2. H2c ch ch2 ch3. h3c-c-ch-ch2-ch3. h3c-ch2-ch2-ch3. h3c - hc = ch2.

H2c c ch ch2. H2c ch ch2 ch3. h3c-c-ch-ch2-ch3. h3c-ch2-ch2-ch3. h3c - hc = ch2.
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