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本文介绍了HNU 12422 Bird Tree问题的解决过程，探讨了题目中隐藏的规律，并通过分析数据特征，提出了一种有效的解题策略。通过对字符串处理和树形结构的理解，利用编程工具成功解决问题。
| roblem description |
The Bird tree1 is an infinite binary tree, whose first 5 levels look as follows: It can be defined as follows:  This is a co-recursive definition in which both occurrences of bird refer to the full (infinite) tree. The expression bird + 1 means that 1 is added to every fraction |
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