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    SELECT CASE WHEN A + B <= C OR A + C <= B OR B + C <= A THEN "Not A Triangle" WHEN A = B AND B = C THEN "Equilateral" WHEN A = B OR A = C OR B = C THEN "Isosceles" ELSE "Scalene" END AS TRIANGLE_TYPE FROM TRIANGLES; this is my answer but still getting error can anyone help or tell whats problem