code: public ADDRESST unregisterParticipant(UUID entityID) {
  		synchronized (mutex()) {
  			removeListener(this.participants.get(entityID));
  			return this.participants.remove(entityID);
  		}
  	}
docs: Remove a participant with the given ID from this repository.
  
  @param entityID identifier of the participant to remove from this repository.
  @return the address that was mapped to the given participant.