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It has to do with the original shapes of numbers. Originally it was not open at the top. Number shapes as we use them come from the number of inside angles they has.
0 had none, 1 had 1, 2 had 2, and so on.
Look at the 4 the way it is shaped in this sentence. it has 3 inside angles in the top portion and 1 made by the tail that drops below the triangle that makes the top portion.
the original shapes of all the numbers follows a similar pattern.
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