6-25 Design the following nonbinary sequence counters as specified in each case. Treat the un- used states as don't care conditions. Analyze the final circuit to ensure that it is self-cor- Chapter 6 Synchronous Sequential Logic recting. If your design produces a nonself-correcting counter, you must modify the circuit to make it self-correcting. (a) Design a counter with the following repeated binary sequence: 0, 1, 2, 3, 4, 5, 6. Use JK flip-flops. (b) Design a counter with the following repeated binary sequence: 0, 1, 2, 4, 6. Use D flip-flops. (c) Design a counter with the following repeated binary sequence: 0, 1, 3, 5, 7. Use T flip-flops. (d) Design a counter with the following repeated binary sequence: 0, 1, 3, 7, 6, 4. Use T flip-flops