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**Note:**
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- $log^*(N)$ is the **iterated logarithm**, which is essentially the number of times we have to apply $log$ to $N$ before it becomes less than or equal to 1.
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- $\mathcal{O}(\log^*(N))$ is almost constant time becuase $\log^*(N) <=5$ for even such a big number like $2^{65536}$.
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- $\mathcal{O}(\log^*(N))$ is almost constant time becuase $\log^*(N) \leqslant 5$ for even such a big number like $2^{65536}$.
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## Operation Union
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