(Solved): please help Draw (R)-2,3-dimethylheptane in a structural condensed format. Use a dash or wedge bond ...

Draw (R)-2,3-dimethylheptane in a structural condensed format. Use a dash or wedge bond to indicate stereochemistry of substituents on asymmetric centers, where applicable. Draw (R)-4-ethyloctane in a structural condensed format. Use a dash or wedge bond to indicate stereochemistry of substituents on asymmetric centers, where applicable. Draw (R)-2,4-dimethylheptane in a structural condensed format. Use a dash or wedge bond to indicate stereochemistry of substituents on asymmetric centers, where applicable.