Itcl - the [incr Tcl] extension

Help: test-captcha
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Bounty program for improvements to Tcl and certain Tcl packages.
Tcl 2018 Conference, Houston/TX, US, Oct 15-19
Send your abstracts to tclconference@googlegroups.com
or submit via the online form by Aug 20.

The "test-captcha" command:

Render an ASCII-art captcha for numbers given on the command line.