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