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** (.):** generalized stochastic network, critical path, average time to perform network schedule, Monte Carlo method.

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** (.):** The well-known concept of a stochastic network with the given multi-dimensional density distribution of arc travel time duration is complemented with a probabilistic mechanism of network structure transformation. A technique is suggested for analytical and simulation modeling of such variable structure networks, with the aim to calculate upper and lower bounds of execution time.

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