There are really three major categories of public bathrooms that I put on my map. There are public public bathrooms, the kind you find in a park, or in a museum. These often do not require you to purchase anything. There are bathroom in public business', such as hotels and restaurants. Then there are kind of public bathrooms, and those are the kind you find in your hotel room. The most common on the map appear to be the public business bathrooms, but the nicest are the private public bathrooms.
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CC