{HEAD ~ The second solution} is then added in {TAIL ~ increments} to the first solution while stirring to precipitate a mixture of oxygen containing compounds of said first element, said second element, cerium, and terbium 
is added in
{ HEAD ~ The second solution } is then added in { TAIL ~ increments } to the first solution while stirring to precipitate a mixture of oxygen containing compounds of said first element , said second element , cerium , and terbium
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH