wyckoffs:
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
- "b"
