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The important step of the analysis of HEP scattering processes is the optimization of the input space for multivariate technique. We propose general recipe how to form the set of low-level observables which are sensitive to the differences in hard scattering processes at the colliders. It will be demonstrated that without any sophisticated analysis of the kinematic properties one can achieve close to optimal performance of DNN with the proposed general set of low-level observables. The proposed approach is already described in [Int.J.Mod.Phys.A 35 (2020) 21, 2050119, hep-ph:2002.09350].