You picked up a book and are reading. This is a result. And if so, there is probably a reason, although it is not certain that you know what it is. In any case, this is what we assume: every result must have a cause. There is a tide on the beach, there is a traffic jam on the road, the girl has blue eyes, one tree grows fast and the other slowly. Why? The results can be seen, but the causes are not always easy to identify.
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