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set of all even natural numbers less than 10 = {2, 4, 6, 8}
The "natural numbers": 11, 12, 13, 14, 15, 16, 17, 18, 19.
There are only four prime numbers less than 10. They are 2, 3, 5 and 7.
less than 10
numbers are less than or equal to 10: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and all the negative numbers