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[]
[null,"Subject ","Marks","Grade",null,"Grade Distribution "]
[null,"Physics",85,null,null,"Marks >= 80","A+"]
[null,"Chemistry",78,null,null,"80 > Marks >= 70","A"]
[null,"Mathematics",91,null,null,"70 > Marks >= 60","B"]
[null,"History",82,null,null,"60 > Marks >= 50","C"]
[null,"Literature",25,null,null,"50 > Marks >= 40","D"]
[null,"Zoology",70,null,null,"Marks < 40","Failed"]
[null,"Astronomy",55]