phase unphased
participant unphased:actor#1 "a1" steps=ask#1
participant unphased:actor#2 "b1" steps=ask#2
participant unphased:actor#3 "c1" steps=ask#3
participant unphased:actor#4 "d1" steps=ask#4
handoff unphased:actor#1 -> unphased:actor#2
handoff unphased:actor#2 -> unphased:actor#3
handoff unphased:actor#3 -> unphased:actor#4
