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O
//
CH3 — CH2 — C — H CH3 — C — CH3
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O
C4H8O
O
//
CH3 — (CH2)2 — C — H C3 — C — CH2 — CH3
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O
C5H10O
O
//
CH3 — (CH2)3 — C — H C2H5 — C — C2H5
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O