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Two-dimensional three-order nonlinear response functions and the laser spectra of the two-level Frenkel-exciton model,interacting with three short laser pulses in direction -k1 + k2 + k3,are calculated using the numerical path integral.The method is non-Markovian and the results show that the numerical simulation scheme provides a new pathway for theoretically investigating the multidimensional ultrafast laser spectra including the non-Markovian effects.