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diff --git a/keyboards/angel17/alpha/alpha.h b/keyboards/angel17/alpha/alpha.h
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+/* Copyright 2019 kakunpc
+ *
+ * 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_numpad_5x4( \
+    k00, k01, k02, k03, \
+    k10, k11, k12, \
+    k20, k21, k22, k13, \
+    k30, k31, k32, \
+    k40, k41, k33 \
+) \
+{ \
+    { k00, k10, k20, k31, k41 }, \
+    { k02, k12, k22, k33, KC_NO }, \
+    { k01, k11, k21, k32, KC_NO }, \
+    { k03, k13, k30, k40, KC_NO }, \
+}