0H5  :>;8G5AB2>  >G:>2  2  A?KB0=88  C<0:   < v a l u e = v 1 > . 
 
 < c e n t e r > "01;8F0  ;845@>2: 
 
 < l e f t > 1 .   < v a l u e = v 2 > :   < v a l u e = v 3 > . 
 
 2 .   < v a l u e = v 4 > :   < v a l u e = v 5 > .   
 
 3 .   < v a l u e = v 6 > :   < v a l u e = v 7 > . 
 
 4 .   < v a l u e = v 8 > :   < v a l u e = v 9 > . 
 
 5 .   < v a l u e = v 1 0 > :   < v a l u e = v 1 1 > . 
 
 6 .   < v a l u e = v 1 2 > :   < v a l u e = v 1 3 > . 
 
 7 .   < v a l u e = v 1 4 > :   < v a l u e = v 1 5 > . 
 
 8 .   < v a l u e = v 1 6 > :   < v a l u e = v 1 7 > . 
 
 9 .   < v a l u e = v 1 8 > :   < v a l u e = v 1 9 > . 
 
 1 0 .   < v a l u e = v 2 0 > :   < v a l u e = v 2 1 > . 