5,184 Ytterbium Surprise Major

Donald F Morrison (no. 8364)
2345678  1  2  3  4  5  6  7 
2348657                 -
3426578     s  s  s            (6 leads)
25463                s     -
4238765  s        s     -  - 
Repeat five times.

Contains all 24 each 56s, 65s, 8765s, 8756s, 5678s off the front, 6578s off the front, 8765s off the front and 8756s off the front, tittums and back rounds.
Also contains 42 backstroke 87s.