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