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In the following description of the three tuple hypothesis ( F, C, L/R ) sequence input a two fork tree plurilateral ( wherein F represents the parent node ID, C said the child node ID, said L/R C F children left or right child ), and in the three input tuple sequence, C is based on the layer order. A node identifier is the type of character. F= C ^ is the root node ID, if C is also a ^ , said the end of input. try to write algorithm, from the input of the three tuple sequence to establish a binary tree of two two binary list, and to the sequence in the sequence output.