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a) Show that T and D flip flops can be made by modifying JK and RS flip flops respectively. Give the characteristics tables of the modified flips flops and verify that they are working as intended. b) Consider a J'K flip-flop with an inverter between external input J' and internal input J. Obtain the flip flop characteristic table. Find out the change in the characteristics of the flip flop if both the external inputs are tied together. c) Design a 4 bit asynchronous binary counter