qmk_firmware/keyboards/handwired/dactyl_rah/dactyl_rah.h

 /* Copyright 2020 Ralph Azucena <ralphie02@live.com>
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */

#pragma once

#include "quantum.h"

#define LAYOUT_6x6(\
    L00, L01, L02, L03, L04, L05,                       R00, R01, R02, R03, R04, R05, \
    L10, L11, L12, L13, L14, L15,                       R10, R11, R12, R13, R14, R15, \
    L20, L21, L22, L23, L24, L25,                       R20, R21, R22, R23, R24, R25, \
    L30, L31, L32, L33, L34, L35,                       R30, R31, R32, R33, R34, R35, \
    L40, L41, L42, L43, L44,                                 R41, R42, R43, R44, R45, \
                                  L55, L54,  R51, R50,                                \
                                       L53,  R52,                                     \
                             L50, L51, L52,  R53, R54, R55                            \
    )\
    {\
        { L00, L01, L02, L03, L04, L05 },   \
        { L10, L11, L12, L13, L14, L15 },   \
        { L20, L21, L22, L23, L24, L25 },   \
        { L30, L31, L32, L33, L34, L35 },   \
        { L40, L41, L42, L43, L44, KC_NO }, \
        { L50, L51, L52, L53, L54, L55 },   \
                                            \
        { R00, R01, R02, R03, R04, R05 },   \
        { R10, R11, R12, R13, R14, R15 },   \
        { R20, R21, R22, R23, R24, R25 },   \
        { R30, R31, R32, R33, R34, R35 },   \
      { KC_NO, R41, R42, R43, R44, R45 },   \
        { R50, R51, R52, R53, R54, R55 }    \
}