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I found this marked for deletion, but I couldn't really see why, though it does need expanding. I did a little myself. The information about commercial sales can be verified by a Google search. I didn't want to give sources in the article, as that looked like advertising. -- Phronima 18:02, 6 February 2007 (UTC) reply

I agree with you, we can expand this a little more, but deleting it would be irrational as it is a very important topic (at least as far as teachers, and students are concerned) Aua Wi se -Talk-

Exam 42.106.180.92 ( talk) 02:36, 16 March 2022 (UTC) reply

O/l 2017 2402:4000:B18B:C05B:1:0:54:5919 ( talk) 02:35, 9 May 2022 (UTC) reply