<p>Some addition to <strong>Debian 10</strong> (Gnome, X11) from above:</p>
<pre><code>ctrl + [
#(2 729109 27 0 2 91 0 1)
ctrl + ]
#(2 773893 29 0 2 93 0 1)

ctrl + {
#(2 564471 27 0 3 123 0 1)
ctrl + }
#(2 665358 29 0 3 125 0 1)

ctrl + C
#(2 808422 67 0 3 67 0 1)
</code></pre>
<p>So, it seems that only for ctrl + Aa-Zz those ASCII and Unicode codes got duplicated. That's very strange.</p>

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