Design a simple 4-bit Johnson Counter by using D flip-flops. The counter should count in the following order: 0000, 1000, 1100, 1110, 1111, 0111, 0011, 0001, 0000, 1000...... What is the least number of flip-flops needed to design a 4-bit Johnson Counter? How many 74LS74 chips do you need? Include in the design a means for resetting the counter to 0000. Provide circuit diagrams, relevant truth tables, state diagrams and state tables.