` CH_(3) -CH_(2) -CH_(2)-CH_(3)``CH_(3) -CH_(2)- underset(CH_(3))underset(|)CH_(2)` `CH_(3) -underset(CH_(3))underset(|)C=CH-CH_(3)` `CH_(3) -CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(3)`
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