1) CH3-CH(CH3)-CH2-CH(CH3)-CH2-CH2-CH32) CH3-CH2-CH(CH2CH3)-CH2-CH2-CH2-CH33) CH3-CH(CH3)-CH2-CH(CH3)-CH(CH3)-CH2-CH2-CH3
1) CH3-CH(CH3)-CH2-CH(CH3)-CH2-CH2-CH3
2) CH3-CH2-CH(CH2CH3)-CH2-CH2-CH2-CH3
3) CH3-CH(CH3)-CH2-CH(CH3)-CH(CH3)-CH2-CH2-CH3