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