lane actor#1 "first" @10:3
lane actor#2 "second" @11:3
lane actor#3 "third" @13:17
region seq#1 seq
step ask#1 ask "first" @10:18 lane=actor#1 region=seq#1 always
step ask#2 ask "second" @11:19 lane=actor#2 region=seq#1 always
step ask#3 ask "third" @13:32 lane=actor#3 region=seq#1 always
edge ask#1 -> ask#3 data always exact
edge ask#2 -> ask#3 seq always
sink ask#2,ask#3
