Graph.java with dfs circle detection output

strict graph {

0[color=red];

1[color=red];

2[color=red];

0--1;

0--2;

1--0;

1--2;

1--3;

2--0;

2--1;

2--3;

2--4;

3--1;

3--2;

3--4;

3--5;

4--2;

4--3;

4--5;

4--6;

5--3;

5--4;

5--6;

5--7;

6--4;

6--5;

6--7;

6--8;

7--5;

7--6;

8--6;

15--16;

16--17;

16--15;

17--16;

19--19;

}

number of points: 13

number of edges: 16

hasCircle: true