{TAIL ~ The anchor structures} may take {HEAD ~ many forms}, and may include barbed, helical, and crimp type anchors 
{ TAIL ~ The anchor structures } may take { HEAD ~ many forms } , and may include barbed , helical , and crimp type anchors
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH