actor-node source
actor-node actor#1 "writer" @6:21
actor-node actor#2 "reviewer" @7:22
actor-node actor#3 "reviser" @9:21
actor-node sink
actor-edge source -> actor#1 exact count=1
actor-edge actor#1 -> actor#2 exact count=1 types="string"
actor-edge actor#2 -> actor#3 exact count=1 types="string"
actor-edge actor#3 -> sink exact count=1 types="string"
