right alt in keys file

Hello

I would like to use Right Alt in my keys file.

"xev" shows me for Right Alt:
state 0x0, keycode 113 (keysym 0xff7e, Mode_switch),
same_screen YES,

And xmodmap shows me:
$ xmodmap -pm

xmodmap:  up to 3 keys per modifier, (keycodes in
parentheses):

shift       Shift_L (0x32),  Shift_R (0x3e)
lock        Caps_Lock (0x42)
control     Control_L (0x25),  Control_R (0x6d)
mod1        Alt_L (0x40),  Alt_L (0x7d),  Meta_L
(0x9c)
mod2        Num_Lock (0x4d)
mod3      
mod4        Super_L (0x7f),  Hyper_L (0x80)
mod5        Mode_switch (0x5d),  ISO_Level3_Shift
(0x7c)

Unfortunately the following does not work in keys
file:

Mod5 Control u :ExecCommand xterm

while the following works for Left Alt:

Mod1 Control u :ExecCommand xterm

What can be wrong with my configuration ?
Thank You for help.


 
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