I feel pretty confident about this one. The valid variable names are probably "myVariable" and "x123". Anything with spaces or special characters wouldn't work.
Okay, let me think this through. Variable names need to start with a letter or underscore, and can only contain letters, digits, and underscores. So I'd say "myVar" and "var_123" are probably the valid options here.
Hmm, I'm not totally sure about this. I know variable names can't have spaces, but I'm not sure about other rules. Maybe "my_variable" and "variable123" could work?
I think I know the answer to this one. Variable names can't have spaces or special characters, so I'd say the valid options are "myVariable" and "x123".
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