lane actor#1 "a" @4:11
lane actor#2 "b" @5:11
lane actor#3 "fallback" @6:49
region seq#1 seq
region branch#1 branch parent=seq#1 @6:43
step ask#1 ask "a" @4:22 lane=actor#1 region=seq#1 always
step ask#2 ask "b" @5:22 lane=actor#2 region=seq#1 always
step ask#3 ask "fallback" @6:67 lane=actor#3 region=branch#1 maybe
edge ask#1 -> ask#3 seq maybe
edge ask#2 -> ask#3 seq maybe
sink ask#1,ask#2,ask#3
