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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 B=C OR C=A then 'Isosceles' else 'Scalene' end as triangle from TRIANGLES;

    //THIS CODE IS CORRECT BUT TEST CASES ARE NOT RUN THEN WHAT IS THE ERROR