partisan-causality-alsberg_day_acked

[{{receive_message,retry_collaborate_ack},[{forward_message,ok}]},
 {{receive_message,collaborate_ack},[{forward_message,ok}]},
 {{receive_message,retry_collaborate},
  [{forward_message,retry_collaborate_ack}]},
 {{receive_message,collaborate},[{forward_message,collaborate_ack}]}].