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