1,0, and -1 or negative one
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2, 3 and 5 are prime numbers that are less than 7
The set of natural numbers less than four is {1, 2, 3}.
2 3 5
There are only four prime numbers less than 10. They are 2, 3, 5 and 7.
3, 3 1/2, 4 1/2, 5