**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.

\(\)

**Notations:**

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

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