`clog_5log_5(3125).`

Explanation

To solve the expression \( \log_5(\log_5(3125)) \), we will follow these steps:

### Step 1: Simplify \( \log_5(3125) \)

We first need to find \( \log_5(3125) \). We know that \( 3125 \) can be expressed as a power of \( 5 \):

\[
3125 = 5^5
...