Additional steps are having {HEAD ~ a central computer} monitor {TAIL ~ inventory levels}, track part request, and order replacement parts when inventory levels fall below a preset level 
monitor
Additional steps are having { HEAD ~ a central computer } monitor { TAIL ~ inventory levels } , track part request , and order replacement parts when inventory levels fall below a preset level
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH