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List the numbers of these sets.

1. { $x$ | $x$ is a real number such that $x^2 =1$ }
2. { $x$ | $x$ is a positive integer less than 12 }
3. { $x$ | $x$ is the square of an integer and $x<100$ }
4. { $x$ | $x$ is an integer such that $x^2 =2$ }
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