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(a) A general scheme of the masked input to be fed to the system is shown. (b) A zoom of the last masked input step is depicted. The state of the present virtual node (dashed arrow) depends in an exponentially decreasing way on the states of previous virtual nodes (solid arrows) The number of relevant nodes to significantly determine a state is called the relevant sequence length m. The black line represents the masked input and the red line the response of the nonlinear node.
