**Fill in the Blank:**

Some of the following 3 expressions are multi-valued, while the rest has/have only one value: $e^{i},\quad i^{i},\quad \sqrt{i}.$ Also, precisely $\text{\_\_\_\_\_\_}$ of them has/have a value that is strictly real.

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**Notations:**

- $e \approx 2.718$ denotes the Euler's number.
- $i = \sqrt{-1}$ denotes the imaginary unit.

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