er

[gv=neato]graph ER {
        node [shape=box]; course; institute; student;
        node [shape=ellipse]; {node [label="name"] name0; name1; name2;}
                code; grade; number;
        node [shape=diamond,style=filled,color=lightgrey]; "C-I"; "S-C"; "S-I";

        name0 -- course;
        code -- course;
        course -- "C-I" [label="n",len=1.00];
        "C-I" -- institute [label="1",len=1.00];
        institute -- name1;
        institute -- "S-I" [label="1",len=1.00];
        "S-I" -- student [label="n",len=1.00];
        student -- grade;
        student -- name2;
        student -- number;
        student -- "S-C" [label="m",len=1.00];
        "S-C" -- course [label="n",len=1.00];

        label = "\n\nEntity Relation Diagram\ndrawn by NEATO";
        fontsize=20;
}[/gv]