phase unphased
participant unphased:actor#4 "seed" steps=ask#1
participant unphased:actor#1 "a0" steps=ask#2~actor#1
participant unphased:actor#2 "a1" steps=ask#2~actor#2
participant unphased:actor#3 "a2" steps=ask#2~actor#3
handoff unphased:actor#4 -> unphased:actor#1 types="string"
handoff unphased:actor#4 -> unphased:actor#2 types="string"
handoff unphased:actor#4 -> unphased:actor#3 types="string"
