{HEAD ~ The amount} of preservative often ranges from about 0.01 percent to about 0.3 percent, {TAIL ~ preferably about 0.5 percent}, based on the total weight of the formulation 
often ranges
{ HEAD ~ The amount } of preservative often ranges from about 0.01 percent to about 0.3 percent , { TAIL ~ preferably about 0.5 percent } , based on the total weight of the formulation
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH