{HEAD ~ The complexing agent} can be added to {TAIL ~ either solution} provided the final mole ratio of complexing agent to zirconium is greater than or equal to 1 
{ HEAD ~ The complexing agent } can be added to { TAIL ~ either solution } provided the final mole ratio of complexing agent to zirconium is greater than or equal to 1
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH