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119. Which of the following choices meets the minimum requirement needed to create specialized waveforms that are used in digital control and sequencing circuits?
(a) basic gates, a clock oscillator, and a repetitive waveform generator
(b) basic gates, a clock oscillator, and a Johnson shift counter
(c) basic gates, a clock oscillator, and a DeMorgan pulse generator
(d) basic gates, a clock oscillator, a repetitive waveform generator, and a Johnson shift counter
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