phase phase#1
participant phase#1:actor#1[0] member=0/4 steps=ask#1
participant phase#1:actor#1[1] member=1/4 steps=ask#1
participant phase#1:actor#1[2] member=2/4 steps=ask#1
participant phase#1:actor#1[3] member=3/4 steps=ask#1
phase phase#2
participant phase#2:actor#2 "writer" steps=ask#2
