{HEAD ~ a second escapement} and a second code reader associated with {TAIL ~ said second queuing station}; and 
associated with
{ HEAD ~ a second escapement } and a second code reader associated with { TAIL ~ said second queuing station } ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH