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We follow the time sequence of binary elastic collisions in a smallcollection of hard-core particles. Intervals between the collisions arecharacterized by the numbers of collisions of different pairs in a given time.It was shown previously that due to the ergodicity these numbers grow with timeas a biased random walk. We show that this implies that for a typicaltrajectory in the phase space each particle has "preferences" that are stableduring indefinitely long periods of time. During these periods the particlecollides more with certain particles and less with others. Thus there is aclearly distinguishable pattern of collisions of the particle with otherparticles, as determined by its initial position and velocity. The effect holdsalso for the dilute gas with arbitrary short-range interactions allowing forexperimental testing. It is the mechanical counterpart to the classicalprobabilistic observation that "in a population of normal coins the majority isnecessarily maladjusted" \cite{Feller}.

Effect of distinguishability of patterns of collisions of particles in a non-equilibrium chaotic system