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