wyckoffs: - "f" - "f" - "c" - "b" - "f" - "f" - "c" - "b" - "f" - "f" - "c" - "b" - "f" - "f" - "c" - "f" - "f" - "c" - "f" - "f" - "c" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "f" - "c" - "c" - "c" - "c" - "c" - "c"