Which of the following four structures represent constitutional isomers of the same molecule, and which one is neither isomeric nor identical to the others? Explain your answers.

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CH3 CH3CHCHCH3 CH3 A CH3 CH3CHCHCH₂CH3 CH3 B CH3CH₂CHCH3 T CH H₂C C CH3 CH3CHCH₂CH₂CH₂CH3 CH3 D