| ︽ | | ︾ ︵ ︽ ︾ | ︶ ︽ ︾ | | | | | 1 | ︽ | ︾ | | | | | ︽ ︾ | | | | | | | | | | | ︽ | ︾ ︽ ︾ ︽ ︾ | | | | | | | | | | | ︽ ︾ | 20 | 100 | | | | | | | | ︽ ︾ 4 12 | | | | | | | | | | | | | | | | | | | | | |