qmk_firmware/keyboards/ymdk/ymd09/ymd09.h

#pragma once

#include "quantum.h"

#define LAYOUT( \
	K00, K01, K02, \
	K10, K11, K12, \
	K20, K21, K22  \
) { \
	{ K00,   K01,   K02 }, \
	{ K10,   K11,   K12 }, \
	{ K20,   K21,   K22 }  \
}