BellBoard

s 572634 1
  465372 1
  574623 3
  745623 4
  237564 2
s 542637 1
s 675342 1
  236475 1
  542736 1
s 765342 1
  237465 1
s 452637 1
  374265 2
  743265 4
  657324 2*
  246735 2
  572346 1
  465237 2
  374526 2
  743526 4
  267354 2#
s 342567 1
s 573642 1
  265473 1
  342765 1
s 753642 1
  267453 1
s 432567 1
  674253 2
  746253 4
  657432 3
  246357 1
s 752634 2
  467352 1
s 324567 1
  ------
6-part, calling bob for final single in parts 3 and 6.
In parts 1,2 and 3, call a single at # to produce *.
In parts 4,5 and 6, call a single at * to produce #.

All of the 748s occur at Backstroke.
Composed Wednesday 28th June 2017.