qmk_firmware/keyboards/alpha/alpha.h

#pragma once

#include "quantum.h"

#define XXX KC_NO

#define LAYOUT( \
    k00, k01, k02, k03, k04, k05, k06, k07, k08, k09, \
    k10, k11, k12, k13, k14, k15, k16, k17, k18, k19, \
    k20, k21, k22, k23,      k25,      k27, k28, k29 \
) { \
    { k00, k01, k02, k03, k04, k05, k06, k07, k08, k09 }, \
    { k10, k11, k12, k13, k14, k15, k16, k17, k18, k19 }, \
    { k20, k21, k22, k23, XXX, k25, XXX, k27, k28, k29 } \
}