It is proved that the R-rotation graph of a elementary coronoid system is a multiple directed rooted tree containing at least 2 trees.
如果冠状系统是基本的，已经证明其R -旋转图至少包含2棵有向根树。
It is proved that the R-rotation graph of a elementary coronoid system is a multiple directed rooted tree containing at least 2 trees.
如果冠状系统是基本的，已经证明其R -旋转图至少包含2棵有向根树。
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