Metro Cards. If you are traveling with a friend or a group and want to use a public transport, then it is better to use "10 viajes" card, because it is multipersonal and you can use one card for 10 people if you want. But 50 viajes card is unipersonal and if you use it for multiple people and get caught later, then get ready to pay a fine of €100. Stay safe, folks;)
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