Second, the length of the blends in these cases is at-most the length of the components.
the blend B can thus be encoded as a string of the exact same length as C by noting that B only contains characters copied from C or deleted from C. we represent B by E(B) denoting the sequence of copy (C) and delete (D) operations needed to transform C to B. E(B) can easily be computed by the edit distance function between C and B.