A +---2---+---3---+----1---+----2---+ | | | | | 2 1 2 2 3 | | | | | +---2---+---3---+----4---+---5----+ | | | | | 3 4 1 2 3 | | | | | +---2---+---2---+---1----+---4----+ | | | | | 2 2 1 3 4 | | | | | +---1---+---3---+---2----+---3----+ B
A +---2---+---3---+----1---+----2---+ | | | | | 2 1 2 2 3 | | | | | +---2---+---3---+----4---+---5----+ | | | | | 3 4 1 2 3 | | | | | +---2---+---2---+---1----+---4----+ | | | | | 2 2 1 3 4 | | | | | +---1---+---3---+---2----+---3----+ B
4 5
2 3 1 2
2 3 4 5
2 2 1 4
1 3 2 3
2 3 2
1 4 2
2 1 1
2 2 3
3 3 4
13