Draw all possible diastereomers of this tricyclic ring system in 2D and 3D. Based on your 3D drawings, rank each structure in terms of energy. Clearly identify all gauche-butane and syn-pentane interactions

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Can you draw all possible diastereomers of this tricyclic ring system in 2D and 3D?. Based on your 3D drawings, rank each structure in terms of energy. Clearly identify all gauche-butane and syn-pentane interactions. Answer is given.
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