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One of the most important things to remember when you go to Rio de Janeiro is not to take a large sum of money in the purse or wallet. You should leave the money in the hotel safe or with your houseguest.
On the other hand, there are a lot of places to visit: beautiful beaches, churches and famous landmarks.
Question - When do we use "on the other hand"? Did I use it here correctly?
I used to have a writing professor who would give me a hard time if I said "on the other hand" without first saying "on the one hand" in a previous, comparative statement.
On the one hand Rio is dangerous... On the other hand it is fun...
On the other hand? 
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