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Let \(A = \{1, 4, 9\}\) and \(B = \{1, 3, 6, 10\}\text{.}\) Find each of the following sets.

1. \(\displaystyle A \cup B\text{.}\)

2. \(\displaystyle A \cap B\text{.}\)

3. \(\displaystyle A \setminus B\text{.}\)

4. \(\displaystyle B \setminus A\text{.}\)