The user, vendor, {TAIL ~ manufacturer} and {HEAD ~ other supplier} may maintain databases housed on the central computers 
The user , vendor , { TAIL ~ manufacturer } and { HEAD ~ other supplier } may maintain databases housed on the central computers
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH