lane actor#1 "writer" @4:16
lane actor#2 "editor" @5:16
region seq#1 seq
region loop#1 loop parent=seq#1 @7:1 bound=3
step ask#1 ask "writer" @8:30 lane=actor#1 region=loop#1 always serial
step ask#2 ask "editor" @9:24 lane=actor#2 region=loop#1 always serial
edge ask#1 -> ask#2 data always exact
edge ask#2 -> ask#1 carry always
sink ask#2
