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I. (10pts) Extra-credit problem A digital circuit is required to display a digital signal on a bar-graph LED, similar to a sound meter on a stereo. You know that the input to your circuit has values from 0 to 3 coded in binary format. You need to indicate the value in a bar graph where progressively more LED turn on as the input number gets higher, as shown in the graph. When the highest number is reached, all LEDs are on. Please design the circuit that can realize the system described above. Y. Y2 D Do 00 01 10 11
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