The comb structure is arranged to be substantially parallel to {HEAD ~ an array} of {TAIL ~ bag breaking bars} 
of
The comb structure is arranged to be substantially parallel to { HEAD ~ an array } of { TAIL ~ bag breaking bars }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL