5,184 Niobium Surprise Major

Donald F Morrison (no. 2627)
23456   B  W  M  H
64352         -  -
45623   -
24536      -  a
24365   -       [-]
Repeat five times, omitting
[-] from alternate parts.
a = V,sM,sF,sM,F,M,sF,V.

Contains 18 each 56s and 65s, 12 each 5678s off the front and 6578s off the front, 9 each 8765s off the front and 8756s off the front, and back rounds.