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