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