5,040 Cambridge Surprise Minor

Donald F Morrison (no. 7950)
2345  F   W   H
2435          s
4523  a   s     |
5324  s   ss  s |A
3425  s  [ss] s |
2435     A*
3425     A*    
Repeat twice.
a = sT,sT.
A* = A, omitting [ss].

No backstroke 65s.