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Problems with variable names

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Provided is a list of variable names. Determine what is wrong (if anything) with each variable name and how to fix it.

- two_wheels
- BTUs-2-watts
- loop
- Another*variable
- stDDev
- mean.

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Solution Summary

Solution also explains "why" behind the wrong variable names.

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As nothing is specified in the question about the programming language in the context of which given variable names should be considered, I am considering the C programming language for this response.

two_wheels:
This variable name is fine.

BTUs-2-watts:
This is considered as an ...

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