Answer the following questions.
A pattern of sound created due to the combination of a sound and its multiple echoes.

Explanation

To answer the question regarding the pattern of sound created due to the combination of a sound and its multiple echoes, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Echo**:
- An echo is the reflection of sound that arrives at the listener after bouncing off a surface. When a sound wave travels, it can hit a wall or other surface, and the sound wave reflects back to the listener.

2. **Defining the Combination of Sound and Echoes**:
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