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    SELECT
        CASE
            WHEN A+B<=C OR B+C<=A  OR  A+C <= B THEN 'Not A Triangle'
            WHEN A = B AND B = C THEN 'Equilateral'
            WHEN A =B OR B=C OR A=C THEN 'Isosceles'
            ELSE 'Scalene'
        END AS TriangleType
    FROM
        TRIANGLES;