I am going to stay in Rio for 2 weeks. Due to my tight budget, I need to rely mainly on public transport to move around. So can you give me some hints on the public transport in Rio? For example, is there a kind of ticket that if I buy one, I can use it in any public transport such as bus and metro for the whole day? If available, please tell me how much it is and where I can buy it? Thanks.
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