[ 2 0 1 3 ] 9 | | | | | | | ( ) ( | ) | | ︽ | | ( | ) | ︾( [ 2 | 0 1 1 ] 7 5 ) | | | | | | | | | | | | | | | | | | | | 2 0 1 3 1 | ︽ | ( )︾ | | | | | | |