<https://forum.digilentinc.com/topic/17794-use-4x4-keypad-using-jb-pmod-port-of-basys3-fpga/>
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<https://forum.digilentinc.com/topic/17794-use-4x4-keypad-using-jb-pmod-port-of-basys3-fpga/#comment-45421>