1wyckoffs:
2- "a"
3- "a"
4- "a"
5- "a"
6- "a"
7- "a"
8- "a"
9- "a"
10- "a"
11- "a"
12- "a"
13- "a"
14- "a"
15- "a"
16- "a"
17- "a"
18- "b"
19- "b"
20- "b"
21- "b"
22- "b"
23- "b"
24- "b"
25- "b"
26- "b"
27- "b"
28- "b"
29- "b"
30