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We talk about time every day. We measure it by the second, minute, hour, day, week, month, year, and century. But what is time? No one can say exactly what it is. It is one of the greatest mysteries of our lives.
We don't know exactly what time is, but our ability to measure it is very important. It makes our way of life possible/ Akk the members of a grouop have to measure time in the same way.
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