{HEAD ~ A fourchette} secures {TAIL ~ portions} of the perimeter of the anterior and posterior portions to one another 
{ HEAD ~ A fourchette } secures { TAIL ~ portions } of the perimeter of the anterior and posterior portions to one another
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH