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@REPLYADDR Mild Shock <bursejan@gmail.com>
@REPLYTO 2:5075/128 Mild Shock
@CHRS: CP866 2
@RFC: 1 0
@RFC-References:
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@RFC-Message-ID:
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@TZUTC: -0700
@PID: G2/1.0
@TID: FIDOGATE-5.12-ge4e8b94
Why will this never fly?

https://www.swi-prolog.org/howto/http/

Because its too static. For example the 
recent SVG example:

    reply_html_page(title(`SVG circle`),
    Etc...

Looks a little pointless to me. Since its static,
You could store an `.svg` file on the server.
How do you draw 12 circles into SVG?

Computed into a grid of 3 x 4 via Prolog?
Make the number of columns and rows 
a parameter to a Prolog predicate.
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