{HEAD ~ The intermediate layer} should have {TAIL ~ a flexural modulus} of 50,000 psi or greater 
{ HEAD ~ The intermediate layer } should have { TAIL ~ a flexural modulus } of 50,000 psi or greater
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH