* * * Printing list of all halfedges of the resulting Arrangement
3
 0/1 0/1 10/1 10/1 20/1 0/1  towards  20/1 0/1
3
 0/1 0/1 10/1 10/1 20/1 0/1  towards  0/1 0/1
2
 20/1 0/1 0/1 0/1  towards  0/1 0/1
2
 20/1 0/1 0/1 0/1  towards  20/1 0/1