  We discuss interplay between the high-twist (HT) terms in the
operator-product expansion and the next-to-next-to-leading-order (NNLO) QCD
corrections to the deep-inelastic-scattering structure functions in analysis of
the high-precision data for charged leptons. Under account of the NNLO
corrections the observed HT terms change within their experimental errors only
and do not vanish in the NNLO.
