wyckoffs:
- "a"
- "c"
- "c"
- "b"
- "e"
- "e"
- "d"
- "d"
- "e"
- "e"
- "f"
- "f"
- "f"
- "f"
- "e"
- "e"
- "f"
- "f"
- "f"
- "f"
- "d"
- "d"
- "d"
- "d"
- "e"
- "e"
- "f"
- "f"
- "f"
- "f"
- "e"
- "e"
- "f"
- "f"
- "f"
- "f"
- "d"
- "d"
- "d"
- "d"
- "f"
- "f"
- "f"
- "f"
- "d"
- "d"
- "d"
- "d"
- "e"
- "e"
- "f"
- "f"
- "f"
- "f"
- "e"
- "e"