Here is the recursive implementation:
First, the data structure. We will be using a mutually recursive pair of a tree, which holds a value, and a forest, which holds a linked list of trees:
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建设海南自由贸易港是习近平总书记亲自谋划、亲自部署、亲自推动的重大国家战略，是党中央着眼新时代全面深化改革开放作出的重大决策。每逢重要时刻、关键节点，习近平总书记都从战略和全局高度为海南发展把脉定向、掌舵领航。2025年11月6日，习近平总书记听取海南自由贸易港建设工作汇报并发表重要讲话，强调建设海南自由贸易港的战略目标，就是要把海南自由贸易港打造成为引领我国新时代对外开放的重要门户，要求认真学习贯彻党的二十届四中全会精神，高标准建设海南自由贸易港。
Eichhorn, a physicist at Heidelberg University in Germany, has over the last decade become a leading theorist investigating this idea, called asymptotic safety. In particular, Eichhorn has emphasized the importance of taking into account the ways in which matter affects space-time, and vice versa. “She is the expert of gravity-matter systems in asymptotic safety,” said Alessia Platania, a physicist at the University of Copenhagen who has worked with Eichhorn.
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