Ib Rasmussen wrote:
But I did know the mirror trick,
> and uses it extensively

And I remembered reading about the mirror trick, but when I needed it
I couldn't remember where.  So I went out and paid like $40 for a book
on algebra, found out what an "identity matrix" is, deduced from there
how to use it to mirror, and was feeling pretty gall-darned proud of 
myself until you through the mirror trick back at me a week or two ago!

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