maintaining said reaction mixture under {HEAD ~ conditions} sufficient to form {TAIL ~ crystals} of said molecular sieve; and 
maintaining said reaction mixture under { HEAD ~ conditions } sufficient to form { TAIL ~ crystals } of said molecular sieve ; and
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH