  If above a critical temperature not only the SU(N_F)_L \times SU(N_F)_R
chiral symmetry of QCD but also the U(1)_A symmetry is restored, then the
actual symmetry of the QCD correlation functions and observables is SU(2N_F).
Such a symmetry prohibits existence of deconfined quarks and gluons. Hence QCD
at high temperature is also in the confining regime and elementary objects are
SU(2N_F) symmetric "hadrons" with not yet known properties.
