{HEAD ~ The invention} relates to {TAIL ~ airfoil core structures} and specifically, wind turbine blades 
relates to
{ HEAD ~ The invention } relates to { TAIL ~ airfoil core structures } and specifically , wind turbine blades
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH