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diff --git a/keyboards/dumbo/dumbo.h b/keyboards/dumbo/dumbo.h
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+/* Copyright 2020 Adam Naldal <[email protected]>
+ *
+ * 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"
+
+/* This a shortcut to help you visually see your layout.
+ *
+ * The first section contains all of the arguments representing the physical
+ * layout of the board and position of the keys.
+ *
+ * The second converts the arguments into a two-dimensional array which
+ * represents the switch matrix.
+ */
+
+#define LAYOUT_split_3x6_4( \
+  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,    R30, R31, R32, R33 \
+  ) \
+  { \
+    { L00, L01, L02, L03, L04, L05 }, \
+    { L10, L11, L12, L13, L14, L15 }, \
+    { L20, L21, L22, L23, L24, L25 }, \
+    { KC_NO, KC_NO, L30, L31, L32, L33 }, \
+    { R05, R04, R03, R02, R01, R00 }, \
+    { R15, R14, R13, R12, R11, R10 }, \
+    { R25, R24, R23, R22, R21, R20 }, \
+    { KC_NO, KC_NO, R33, R32, R31, R30 } \
+  }