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keymap.c
#include QMK_KEYBOARD_H

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
      [0] = LAYOUT(
          KC_Z,
          KC_X
      ),
      [1] = LAYOUT(
          _______,
          _______
      ),
      [2] = LAYOUT(
          _______,
          _______
      ),
      [3] = LAYOUT(
          _______,
          _______
      )
};