1) CH3CH2CH(CH3)CH2CH2CH2CH32) CH3CH2CH(CH3)CH(CH3)CH2CH33) (CH3)2CHCH2CH2CH34) CH3CH(CH3)CH(CH3)CH2CH3
1) CH3CH2CH(CH3)CH2CH2CH2CH3
2) CH3CH2CH(CH3)CH(CH3)CH2CH3
3) (CH3)2CHCH2CH2CH3
4) CH3CH(CH3)CH(CH3)CH2CH3