Charmin had set up what appeared to be a 10-hole privy station on 42nd Street, which came in handy after a long walk across town.

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Mr Gonzalez's wife told the BBC on Monday that one of the first things they would do after arriving would be to go for a long walk together.

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Michelle can still remember her father heading out to his job as a city worker long after multiple sclerosis had made it impossible for him to walk without crutches.

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In the mathematical world, he would walk down a long corridor, opening one numbered door after another.

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If the line is long, some airports have other checkpoints that may be faster, even after a walk to get there.

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