Stochastic simulation technique has been successfully employed for the study of numerous unstable growth processes of different physical nature like electrochemical deposition and growth of crystals~(13), ~(14_15), ~(20),~(22),~(23),~(24_25), dielectric breakdown of insulators~(17), carbonate acidizing~2,~3,~5,~(24),~(25),~(30), viscous fingering ~4,~7,~8,~9,~(11_12),~(19),~(18),~(22),~(25_27);~(31) and others. Results of stochastic simulation are characterized by the following common feature: they amaizingly resemble some of the important characteristics of natural phenomena, processes that are peeped at the nature or duplicated in experiments. In particular, stochastic simulation perfectly reflects the nature of those processes and describes a so-called "tip-splitting" effect that can not be simulated by conventional methods.
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