5,184 Niobium Surprise Major

Donald F Morrison (no. 2624)
23456  B  W  M  H
52364  -        2
32465        -
32654  -        -
53246  -        2
25634     -  -
46253     -  -  -
46532  -        -
34625  -        2
42356  -         
Repeat twice.

Contains 21 56s, 18 65s and back rounds.