On 3/30/18, 11:58 AM, "sqlite-users on behalf of Simon Slavin" 
<sqlite-users-boun...@mailinglists.sqlite.org on behalf of 
slav...@bigfraud.org> wrote:
> can think of to do it is to devise a metric to turn a pair (a, b) into one 
> number.

Problem is you can't uniquely order pairs of points. Is (1, 2) greater or 
lesser than (2, 1)?

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