The amount of the metal contained in the flexible thermosetting resin and {HEAD ~ the thermosetting resin} containing the boron is preferably present in {TAIL ~ excess} of the amount stoichiometrically necessary to combine with the boron present 
is preferably present in
The amount of the metal contained in the flexible thermosetting resin and { HEAD ~ the thermosetting resin } containing the boron is preferably present in { TAIL ~ excess } of the amount stoichiometrically necessary to combine with the boron present
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH