Where the `TVs` and `OV s` are located in a closet packed structure?

Explanation

To determine the locations of tetrahedral voids (TVs) and octahedral voids (OVs) in a closed packed structure, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Voids in Closed Packed Structures**:
- Voids are the unoccupied spaces between spheres in a closed packed structure. They are also referred to as interstices.

2. **Identifying Tetrahedral Voids**:
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