 component is present in {HEAD ~ an amount} of from about 99 to about 1 percent by weight based on {TAIL ~ the combined quantities} of components and  
component is present in { HEAD ~ an amount } of from about 99 to about 1 percent by weight based on { TAIL ~ the combined quantities } of components and
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH