wyckoffs:
- "e"
- "e"
- "f"
- "f"
- "f"
- "f"
- "e"
- "e"
- "e"
- "f"
- "f"
- "e"
- "e"
- "f"
- "e"
- "f"
- "f"
- "e"
- "e"
- "f"
- "f"
- "f"
- "f"
- "f"
- "f"
- "f"