Windows W
i
Width L
i
W
0
L
0
W
1
L
1
= L
0
× 2
W
2
L
2
= L
1
× 2
W
3
L
3
= L
2
× 2
W
4
L
4
= L
3
× 2
W
5
L
5
= L
4
× 2