   1   1
2.0
   2   2
1.0   2.
3.0   4.0
   3   3
1.0   2.0   3.
4.0   5.0   6.
7.0   8.0   9.0
   3   2
1.0   2.0   3.
4.0   5.0   6.0
   2   3
1.0   2.
3.0   4.
5.0   6.0
   0   0
