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Hah, my "trivial answer" was converted to a comment. Anyway, you may have been thinking of Mark Sapir's post, as more appropriately linked to here: http://mathoverflow.net/a/137715/2926.
Hah, my "trivial answer" was converted to a comment. Anyway, you may have been thinking of Mark Sapir's post, as more appropriately linked to here: https://mathoverflow.net/a/137715/2926.
Hah, my "trivial answer" was converted to a comment. Anyway, you may have been thinking of Mark Sapir's post, as more appropriately linked to here: http://mathoverflow.net/a/137715/2926.
