m is a number in the range from 1 to f, wherein f is {HEAD ~ the total number} of {TAIL ~ isocyanate groups} per molecule of isocyanate compound; and 
m is a number in the range from 1 to f , wherein f is { HEAD ~ the total number } of { TAIL ~ isocyanate groups } per molecule of isocyanate compound ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH