lane actor#1 "critic" @5:24 families=loop#1
lane actor#2 "writer" @10:20
region seq#1 seq
region loop#1 loop parent=seq#1 @4:1 label="refine"
step ask#1 ask "critic" @5:40 lane=actor#1 region=loop#1 always serial
step ask#2 ask "writer" @10:36 lane=actor#2 region=seq#1 always
edge ask#2 -> ask#1 data always exact
edge ask#1 -> ask#1 carry always
sink ask#1
