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Matching Question Model and Program

Matching Question Model and Program

I have written a Matching Question program. It works like Rob Howard's Matching, but I found a expand / collapse tree driver. The keyboard access is consistent. WARNING: Undo doesn't work at all.
http://theenabledweb.com/lowvis/match-problem/
is the URL of the page.

A compressed folder is included with all the code.

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