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1.13 (2) Figure P1.13 shows the signal-flow graph of a 2-2-2-1 feedforward network. The func- tion o(-) denotes a logistic function. Write the input-output mapping defined by this network. (b) Suppose that the output neuron in the signal-flow graph of Fig. P1.13 operates in its linear region. Write the input-output mapping defined by this new network. 70 Chapter 1 Introduction 3 PO -1 -2 VO 2 4 -3 V.) PO) 6 FIGURE P1.13