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