-9
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The elements of the set {-10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1} is one possible answer.
The numbers are: 1 and 20
the common multiples between 1 and 100 for 9 and 10 are just 90!
-10 and 1
By multiplying with integers. For example, the multiples of 10 are: 10 x 0 10 x 1 10 x 2 etc.
60