class_docstr: Class to help find signs in tree
code: def _reset(self, found=""):
      self.found = found
      self.current_node = self.root
  
imports: from collections import defaultdict, deque
  import heapq
label_desc: Use image node_id 3 for calling the TreeFinder obj's underlying member method code with example usage: obj._reset(found) without return types