  A particular case of a causal set is considered that is a directed dyadic
acyclic graph. This is a model of a discrete pregeometry on a microscopic
scale. The dynamics is a stochastic sequential growth of the graph. New
vertexes of the graph are added one by one. The probability of each step
depends on the structure of existed graph. The particular case of dynamics is
based on binary alternatives. Each directed path is considered as a sequence of
outcomes of binary alternatives. The probabilities of a stochastic sequential
growth are functions of these paths. The goal is to describe physical objects
as some self-organized structures of the graph. A problem to find
self-organized structures is discussed.
