lane actor#1 "planner" @4:17
lane actor#2 "seed" @5:20
region seq#1 seq
step ask#1 ask "seed" @5:34 lane=actor#2 region=seq#1 always
step ask#2 ask "d" @7:21 lane=actor#1 region=seq#1 always
edge ask#1 -> ask#2 data always exact
sink ask#2
