What forces are responsible for the stability of `alpha`-helix. Why is it also known as `3.6_(13)` helix?

Explanation

### Step-by-Step Solution:

1. **Understanding the Alpha Helix Structure**:
- The alpha helix is a common structural motif in proteins, characterized by a right-handed coil.
- It is formed by the folding of the polypeptide chain into a helical structure.

2. **Forces Responsible for Stability**:
- The primary force that stabilizes the alpha helix is **hydrogen bonding**.
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