lane actor#1 "planner" @12:17
lane actor#2 "reviewer" @13:18
region seq#1 seq
region loop#1 loop parent=seq#1 @19:1
step ask#1 ask "planner" @15:28 lane=actor#1 region=seq#1 always
step ask#2 ask "reviewer" @20:34 lane=actor#2 region=loop#1 maybe serial
edge ask#1 -> ask#2 data maybe exact
edge ask#2 -> ask#2 carry maybe
sink ask#2
