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Structure functions and polarization observables in elastic scattering oflongitudinally polarized electron on polarized deuteron are considered withinapproximation of one-photon + two-photon exchange. It is shown thatcontribution of two-photon exchange in the generalized structure function A isof order of few percent, while in the generalized structure function B it is oforder of 10--20 %. We have found that components T_{20} and T_{21} of tensoranalyzing power are mainly determined by one-photon exchange, but T_{22} ismainly determined by interference between one-photon exchange and two-photonexchange. We have also considered polarization observables T_{11}, C_{21} andC_{22} which are proportional to imaginary part of the reaction amplitude andvanish in the framework of one-photon exchange.

Two-photon exchange and elastic scattering of longitudinally polarized electron on polarized deuteron