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Hi Susan,

1.Is the phrase 'on the other hand' formal or informal?

2.Can but, still, yet, however and on the other hand all be used in contrasting sentences?
For example,

1.It is a fat dog, but its owner is thin.
It is a fat dog. Still, its owner is thin.
"However" and "yet" aren't appropriate here because the example is informal, right?

2.Some people prefer to live in the country, but/yet others prefer to live in the city.
Some people prefer to live in the country. However, others prefer to live in the city.
"Still" isn't proper here because the example is formal, right?

Can I use 'on the other hand' in both examples?

Thank you very much for your comment.