All parts, {HEAD ~ percentages} and ratios used herein are expressed by {TAIL ~ weight} unless otherwise specified 
are expressed by
All parts , { HEAD ~ percentages } and ratios used herein are expressed by { TAIL ~ weight } unless otherwise specified
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH