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diff --git a/users/ibnuda/abstraction.h b/users/ibnuda/abstraction.h
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+/* Copyright 2021 Ibnu D. Aji
+ *
+ * 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"
+
+enum {
+    _BASE,
+    _LOWER,
+    _RAISE,
+    _ADJUST,
+};
+
+// keycode abstraction
+// ABC:
+//  A: L  = left
+//     R  = right
+//  B: U  = upper row
+//     M  = middle row
+//     L  = lower row
+//  C: P  = pinky finger
+//     R  = ring finger
+//     M  = middle finger
+//     I  = index finger
+//     II = inner index finger
+#define LUP  KC_Q
+#define LUR  KC_V
+#define LUM  KC_C
+#define LUI  KC_P
+#define LUII KC_B
+#define LMP  KC_R
+#define LMR  KC_S
+#define LMM  KC_T
+#define LMI  KC_H
+#define LMII KC_D
+#define LLP  KC_QUOT
+#define LLR  KC_J
+#define LLM  KC_G
+#define LLI  KC_K
+#define LLII KC_X
+
+#define RUP  KC_Z
+#define RUR  KC_Y
+#define RUM  KC_U
+#define RUI  KC_L
+#define RUII KC_DOT
+#define RMP  KC_O
+#define RMR  KC_I
+#define RMM  KC_A
+#define RMI  KC_N
+#define RMII KC_F
+#define RLP  KC_SLSH
+#define RLR  KC_SCLN
+#define RLM  KC_W
+#define RLI  KC_M
+#define RLII KC_COMM
+
+
+// thumb keys.
+#define TRAISE   TG(_RAISE)
+#define AL_ENT   ALT_T(KC_ENT)
+#define SF_BSPC  SFT_T(KC_BSPC)
+#define CT_ESC   CTL_T(KC_ESC)
+
+// home row mods.
+#define CTLR    LCTL_T(LMR)
+#define CTRR    RCTL_T(RMR)
+#define CT_LEFT LCTL_T(KC_LEFT)
+#define CT_SIX  RCTL_T(KC_6)
+
+#define SHLP    LSFT_T(LMP)
+#define SHRP    RSFT_T(RMP)
+#define SH_HASH LSFT_T(KC_HASH)
+#define SH_ZERO RSFT_T(KC_0)
+
+#define ALLM    LALT_T(LMM)
+#define ALRM    RALT_T(RMM)
+#define AL_DOWN LALT_T(KC_DOWN)
+#define AL_FIVE RALT_T(KC_5)
+
+#define GULII   RGUI_T(LMII)
+#define GURII   LGUI_T(RMII)
+#define GU_DLR  RGUI_T(KC_DLR)
+#define GU_EQL  LGUI_T(KC_EQL)
+
+// layer toggle.
+#define LW_E     LT(_LOWER, KC_E)
+#define RS_SPC   LT(_RAISE, KC_SPC)
+
+#define ADDDD    MO(_ADJUST)
+
+// common shortcuts for windows and linux that i use.
+#define NXTTAB LCTL(KC_PGDN)
+#define PRVTAB LCTL(KC_PGUP)
+#define UPTAB  LCTL(LSFT(KC_PGUP))
+#define DNTAB  LCTL(LSFT(KC_PGDN))
+#define NXTWIN LALT(KC_TAB)
+#define PRVWIN LALT(LSFT(KC_TAB))
+#define CALDL  LCTL(LALT(KC_DELT))
+#define TSKMGR LCTL(LSFT(KC_ESC))
+#define EXPLR  LGUI(KC_E)
+#define LCKGUI LGUI(KC_L)
+#define CONPST LSFT(KC_INS)
+#define CLSGUI LALT(KC_F4)