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  1. \(\displaystyle \{1, 3, 4, 6, 9, 10\}\text{.}\)

  2. \(\displaystyle \{1\}\text{.}\)

  3. \(\displaystyle \{4,9\}\text{.}\)

  4. \(\displaystyle \{3, 6, 10\}\text{.}\)

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