qmk_firmware/keyboards/handwired/myskeeb/myskeeb.h

#include "quantum.h"

#define XXX KC_NO

#define LAYOUT( \
    L00, L01, L02, L03, L04, L05, L06,   R00, R01, R02, R03, R04, R05, R06, \
    L10, L11, L12, L13, L14, L15, L16,   R10, R11, R12, R13, R14, R15, R16, \
    L20, L21, L22, L23, L24, L25,             R21, R22, R23, R24, R25, R26, \
    L30, L31, L32, L33, L34, L35, L36,   R30, R31, R32, R33, R34, R35, R36, \
    L40, L41, L42, L43, L44, L45, L46,   R40, R41, R42, R43, R44, R45, R46  \
    ) \
    { \
        { L00, L01, L02, L03, L04, L05, L06 }, \
        { L10, L11, L12, L13, L14, L15, L16 }, \
        { L20, L21, L22, L23, L24, L25, XXX }, \
        { L30, L31, L32, L33, L34, L35, L36 }, \
        { L40, L41, L42, L43, L44, L45, L46 }, \
        { R00, R01, R02, R03, R04, R05, R06 }, \
        { R10, R11, R12, R13, R14, R15, R16 }, \
        { XXX, R21, R22, R23, R24, R25, R26 }, \
        { R30, R31, R32, R33, R34, R35, R36 }, \
        { R40, R41, R42, R43, R44, R45, R46 }  \
    }