Select the first note in each pair, then Cmd/Ctrl+select the second note in each pair. Then hit S.
Repeat three times.
Hit F with the bottom slur selected to flip it under, then go into Engrave mode and do some frustrating dragging.
Select the first note in each pair, then Cmd/Ctrl+select the second note in each pair. Then hit S.
Repeat three times.
Hit F with the bottom slur selected to flip it under, then go into Engrave mode and do some frustrating dragging.