5,120 Jesus College Surprise Major

Donald F Morrison (no. 2179)
234567  M  sT/sV  W  H
24356                s
54632        x       s
376524      sV    s
637524  s    x    s
537624  s    a    s  s
574623      sV       s
437652      sT    s
327645       b    s  -
463527  s    c    s
56432   s    x       s
42635        x    s
32465   s    x       s
Repeat.
a = sB,F,sB,sF,B,sV.
b = sF,sB,sF,B,sV.
c = sB,F,sB,sV.

Contains back rounds, with no backstroke 87s, and is all the work.