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To implement a Generalized Suffix Tree in Java, you need to follow the steps below:

1. Define a Node class to represent the nodes of the suffix tree. Each node must have the following attributes:

• A reference to its parent node
• A mapping of its children nodes, represented as a HashMap where the key is the character that the child node represents and the value is the child node itself
• The starting and ending indices of the substring associated with the edge that leads to this node

1. Define a SuffixTree class that will contain the root node of the suffix tree and other methods for constructing and searching the tree. The constructor should initialize the root node to an empty string, set the starting index to -1, and the ending index to -1.

2. Implement the insert() method to insert a new string into the suffix tree. The algorithm for inserting a string is as follows:

• Create a pointer to the root node.
• For each character in the string, check if the character is already present as a child of the current node. If it is, move the pointer to that child node. Otherwise, create a new child node with the appropriate starting and ending indices, add it to the children map of the current node, and move the pointer to the new child node.
• Repeat step 2 until all characters in the string have been processed.

1. Implement the search() method to search for a pattern in the suffix tree. The algorithm for searching is as follows:

• Create a pointer to the root node.
• For each character in the pattern, check if the character is already present as a child of the current node. If it is not, the pattern is not present in the tree, and the search can terminate. If it is, move the pointer to that child node and continue to the next character in the pattern.
• If all characters in the pattern have been processed and the current node is a leaf node, the pattern is present in the tree. Otherwise, the pattern is not present in the tree.

1. Implement other methods for constructing the tree, such as building the tree from a set of strings or reducing the tree to its minimal form.

2. Test your implementation with various inputs to ensure correctness and efficiency.

Note that implementing a Generalized Suffix Tree can be a complex task that requires a deep understanding of algorithms and data structures. It may be helpful to consult existing open-source implementations of the algorithm or seek guidance from experienced developers.