What are all the stereoisomers of 1-ethyl-3-methylcyclohexane?

What are all the stereoisomers of 1-ethyl-3-methylcyclohexane? The following image shows my attempt to answer the question. But I am not sure if I am correct. 


[![enter image description here](https://i.stack.imgur.com/cs2OX.png)](https://i.stack.imgur.com/cs2OX.png)


Note: I am treating this cyclohexane as flat since it's confomers interconvert rapidly.




For me, your answer seems right ... but you should think of other abbreviations for ethyl and methyl groups.


$\hskip2.5in$![enter image description here](https://i.stack.imgur.com/2yu5L.png)


Strictly there are eight missing hydrogens per structure that you should add for clarification: three for each methyl- and five for each ethyl-group. C or C$\_2$ is not a common (and as for C$\_2$ not a good\*) abbreviation for such groups ... Me and Et or CH$\_3$ and C$\_2$H$\_5$ would be more usual.




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\* e.g., C$\_2$ could be $\ce{-C#CH}$ or $\ce{-CH=CH2}$


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