lane actor#1 "wa" @7:11
lane actor#2 "wb" @8:11
lane actor#3 "wc" @11:22
lane actor#4 "reader" @13:19
region seq#1 seq
step ask#1 ask "a" @9:34 lane=actor#1 region=seq#1 always
step ask#2 ask "b" @9:49 lane=actor#2 region=seq#1 always
step ask#3 ask "wc" @11:34 lane=actor#3 region=seq#1 always
step ask#4 ask "reader" @13:35 lane=actor#4 region=seq#1 always
edge ask#1 -> ask#3 seq always
edge ask#1 -> ask#4 data always exact
edge ask#2 -> ask#3 seq always
edge ask#3 -> ask#4 data always exact
sink ask#4
