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We revisit the short-time dynamics of 2D Ising model with three spininteractions in one direction and estimate the critical exponents $z,$$\theta,$ $\beta$ and $\nu$. Taking properly into account the symmetry of theHamiltonian we obtain results completely different from those obtained by Wanget al.. For the dynamic exponent $z$ our result coincides with that of the4-state Potts model in two dimensions. In addition, results for the staticexponents $\nu$ and $\beta$ agree with previous estimates obtained from finitesize scaling combined with conformal invariance. Finally, for the new dynamicexponent $\theta$ we find a negative and close to zero value, a result alsoexpected for the 4-state Potts model according to Okano et al.Comment: 12 pages, 9 figures, corrected Abstract mistypes, corrected equation  on page 4 (Parameter Q

DYNAMIC CRITICAL EXPONENTS OF THE ISING MODEL WITH MULTISPIN INTERACTIONS