What is the name of the craze?, Where is this craze popular?, What do people try to do faster than the train?, How many underground stations do you choose?, Are the stations near or far?, Do you buy a ticket?, Do you get on the train first?, What happens when the train arrives?, Do you go up the stairs or the escalator?, How do you go to the next station?, Can you take a taxi?, Can you ride a bicycle?, What must you do?, Is it dangerous to lose your way?, Is it easier with help?, Who can help you cross the road?, What must you do at the second station?.

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