The resulting article has {TAIL ~ a shape retaining, non tacky flexible consistency} which allows {HEAD ~ the shape} to be further modified, if necessary 
The resulting article has { TAIL ~ a shape retaining , non tacky flexible consistency } which allows { HEAD ~ the shape } to be further modified , if necessary
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH