lane actor#1 "writer" @7:15
lane actor#2 "reader" @9:8
region seq#1 seq
step ask#1 ask "writer" @7:31 lane=actor#1 region=seq#1 always
step ask#2 ask "reader" @9:24 lane=actor#2 region=seq#1 always
edge ask#1 -> ask#2 data always exact
sink ask#2
