wyckoffs:
- "f"
- "f"
- "f"
- "f"
- "a"
- "d"
- "a"
- "d"
- "i"
- "i"
- "i"
- "i"
- "i"
- "i"
- "i"
- "i"
- "i"
- "i"
- "i"
- "i"