https://www.chegg.com/homework-help/questions-and-answers/d-flip-flop-synchronous-reset-load-draw-schematic-show-would-add-combinational-logic-along-q28440848 https://www.chegg.com/homework-help/questions-and-answers/use-new-d-flip-flop-symbol-provided-figure-421-design-4-bit-scalable-bit-sliced-synchronou-q42493718 https://www.chegg.com/homework-help/questions-and-answers/424-4-bit-synchronous-wrap-aroung-counter-sycnhronous-select-count-enable-asynchronous-res-q77409602