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