You are given a graph as a list of node objects. Each node contains a character and a list of neighboring nodes that can be visited next. Design and implement a function: `boolean existsPath(List<Node> nodes, String target)` Return `true` if there exists a path whose node characters, in order, exactly form `target`. The path may start from any node. During one attempted match, the same node cannot be reused. The graph may contain cycles and repeated characters. Example node shape: `Node { char value; List<Node> neighbors; }` Discuss edge cases and the time and space complexity. Possible follow-ups include handling very large graphs, pruning repeated searches, and adapting the solution if nodes may be reused.