qmk_firmware/keyboards/tenki/tenki.h

#pragma once

#include "quantum.h"

#define LAYOUT_ortho_5x4( \
    K00,   K01,   K02,   K03, \
    K10,   K11,   K12,   K13, \
    K20,   K21,   K22,   K23, \
    K30,   K31,   K32,   K33, \
    K40,   K41,   K42,   K43  \
) { \
	{ K00,   K01,   K02,   K03}, \
	{ K10,   K11,   K12,   K13}, \
	{ K20,   K21,   K22,   K23}, \
	{ K30,   K31,   K32,   K33}, \
	{ K40,   K41,   K42,   K43} \
}