... use of the value n that was fetched before by n <- byte. The bulk of the data is of course consumed in the entropy part of an SOS segment.sofSeg = ((y,x), fcs)| _ <- word, _ <- byte, ... species the previous dccoecient, and returns the new coecient as part of the result for use in the next block. After the dc coecient, the ac coecients are fetched form the bits state. Together, ... coecient from the bits in the state. As a nal optimization this isnot the value of the dc coecient itself, but the dierence from the dc coecient of the previousblock. Therefore, the function...