BellBoard

https://complib.org/composition/43223

 6   19    (1342658709E)
-------------------------
  (a)       513264
     3*     512463
 –   –      215364
 –   S      5123
-------------------------
  (b)       21546378E90
     S  |   213465
 –   S  |   3124
     2* |A  3142
 –   2  |   4123
 –   S  |   2143
-------------------------
  (c)       2154637809E
   A        214365
-------------------------
  (d)       21546387E90
   A        214365
-------------------------
  (c)       2154638709E
   A        214365
-------------------------
			
2* = –S
3* = S–S
(a) = 3, 7S, 9, 11, 12S, 14, 17, 20, 23, 25, 26S, 28 (28 sixes)
(b) = 2, 6, 13S, 15S, 19
(c) = 2, 15S, 19
(d) = 2, 13S, 15S, 19
Start at backstroke with rounds as the 3rd row of a slow six.