All S | W cross, pass ptr LS ; chase back to own side
9-16
12 All S | 1c Petronella into middle [M fin facing up, W down] while 2c+3c Petronella in tandem [M fin facing up, W down]
13-20
16 All S| 1M Petronella to 1W’s pl while 1W Petronella to 3M’s pl while 2c+3c Petronella in tandem [2M to 3W’s pl, 3M to 2W’s pl, 2W to 1M’s pl, 3W to 2M’s pl]
17-24
All S | M cross, pass ptr LS ; chase back to opp side