In addition, there is no possibility of causing variations in {HEAD ~ projection angle adjustment} among {TAIL ~ maintenance workers} 
In addition , there is no possibility of causing variations in { HEAD ~ projection angle adjustment } among { TAIL ~ maintenance workers }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL