[Retracted] Self-Study System Evaluation of Oral English Based on Limit Theory

<div>Different types of Markov chains: (a) The first model of the Markov chain. (b) The second model of the Markov chain. (c) The third model of Markov chain.</div>

Mathematical Problems in Engineering

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Figure 4: [Retracted] Self-Study System Evaluation of Oral English Based on Limit Theory 