lane actor#1 "scanner" @7:16
lane actor#2 "writer" @12:8
region seq#1 seq
step ask#1 ask "scanner" @7:33 lane=actor#1 region=seq#1 always
step ask#2 ask "writer" @12:24 lane=actor#2 region=seq#1 always
edge ask#1 -> ask#2 data always exact
sink ask#2
