code: def valid_tree(binary_tree):
      if len(binary_tree) > 1:
          return False
  
      tree = binary_tree[0]
      parts = tree.split()
  
      count_brackets = 0
      for part in parts:
          if part == "(":
              count_brackets += 1
          elif part == ")":
              count_brackets -= 1
  
          if count_brackets < 0:
              return False
  
      if count_brackets == 0:
          return True
  
file_path: textflint/textflint/common/utils/overlap_templates.py
imports: import random
  import numpy
label_desc: Use image node_id 4 for calling a global function with example usage: valid_tree(binary_tree) and returns: False, True, False