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4 [Connected systems (50 Pts Let and Let IH be a system such that its input r and output y are related by (a) Draw a block diagram for IH using hi, h2, and hz (b) Is H an LTI system? Justify your answer. (c) Let h denote the impulse response of the system H. Express h using hi, h2, and h3. (d) Show how each sample h[n] at time n is expressed (e) Is I stable? Justify your