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Provide the most stable (lowest energy) chair conformation of trans-1-tert-butyl-4-methylcyclohexane. Relative cis/trans stereochemistry is graded. Provide the most stable (lowest energy) chair conformation of trans-1,3-dimethylcyclohexane. Relative cis/trans stereochemistry is graded. Provide the most stable (lowest energy) chair conformation of cis-1-tert-butyl-4-methylcyclohexane. Relative cis/trans stereochemistry is graded. Provide the most stable (lowest energy) chair conformation of cis-1,4-dimethylcyclohexane. Relative cis/trans stereochemistry is graded. Provide the least stable (highest energy) chair conformation of trans-1,2-dimethylcyclohexane. Relative cis/trans stereochemistry is graded