keycode   1 = Escape
        alt     keycode   1 = Meta_Escape
        shift   alt     keycode   1 = Meta_Escape
        altgr   alt     keycode   1 = Meta_Escape
        shift   altgr   alt     keycode   1 = Meta_Escape
        control alt     keycode   1 = Meta_Escape
 [...]
keycode  79 = KP_1
        altgr   keycode  79 = Hex_1
        alt     keycode  79 = Ascii_1
        shift   alt     keycode  79 = Hex_1
        altgr   shiftl  keycode  79 = Hex_1
        alt     shiftl  keycode  79 = Ascii_1
        shift   alt     shiftl  keycode  79 = Hex_1
        altgr   shiftr  keycode  79 = Hex_1
        alt     shiftr  keycode  79 = Ascii_1
        shift   alt     shiftr  keycode  79 = Hex_1
        altgr   shiftl  shiftr  keycode  79 = Hex_1
        alt     shiftl  shiftr  keycode  79 = Ascii_1
        shift   alt     shiftl  shiftr  keycode  79 = Hex_1
        altgr   ctrll   keycode  79 = Hex_1
        alt     ctrll   keycode  79 = Ascii_1
        shift   alt     ctrll   keycode  79 = Hex_1
        altgr   shiftl  ctrll   keycode  79 = Hex_1
        alt     shiftl  ctrll   keycode  79 = Ascii_1
        shift   alt     shiftl  ctrll   keycode  79 = Hex