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SELECT MINX, MAXY
FROM
(SELECT MIN(X) AS MINX, MAX(Y) AS MAXY, X+Y AS SUMXY, ABS(X-Y) AS DIFF, COUNT(X) AS COUNTX
FROM FUNCTIONS
GROUP BY SUMXY, DIFF
HAVING COUNTX = 2
ORDER BY MINX) SUB
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SELECT MINX, MAXY FROM (SELECT MIN(X) AS MINX, MAX(Y) AS MAXY, X+Y AS SUMXY, ABS(X-Y) AS DIFF, COUNT(X) AS COUNTX FROM FUNCTIONS GROUP BY SUMXY, DIFF HAVING COUNTX = 2 ORDER BY MINX) SUB