In the following multiplication, certain digits have been
replaced with asterisks (*). Replace all the asterisks such
that the problem holds the result.
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* * 7
X 3 * *
----------
* 0 * 3
* 1 *
* 5 *
-------------
* 7 * * 3
A simple one.
1 1 7
X 3 1 9
----------
1 0 5 3
1 1 7
3 5 1
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3 7 3 2 3
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