lane actor#1 "writer" @6:15
lane actor#2 "editor" @8:41
region seq#1 seq
region branch#1 branch parent=seq#1 @7:30
region branch#2 branch parent=branch#1 @8:30
step ask#1 ask "writer" @6:31 lane=actor#1 region=seq#1 always
step ask#2 ask "editor" @8:57 lane=actor#2 region=branch#2 maybe
edge ask#1 -> ask#2 data maybe inexact
sink ask#2
