{HEAD ~ The method} depends on {TAIL ~ the type} of shell and on how the shape memory material is utilized 
{ HEAD ~ The method } depends on { TAIL ~ the type } of shell and on how the shape memory material is utilized
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH