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