input: 
  from typing import List
  
  class VersionControl:
      def __init__(self, lines: List[str]):
          self.lines = lines
          self.mark = 0
   
      def commit(self):
          self.mark += 1
          log_file = open("log_file.txt", "a+")
          log_file.write(str(self.mark) + ": " + str(self.lines) + "\n")
          log_file.close()
   
      def restore(self):
          log_file = open("log_file.txt", "r")
          lines = log_file.readlines()
          to_mark = self.mark-1
   
          self.lines = lines[to_mark].split(": ")[1].strip()
          log_file.close()
  
  # Example usage:
  # vc = VersionControl(["def hello():\n", "\tprint('Hello, World!')"])
  # vc.commit()
  # vc.lines.append("\n")
  # vc.commit()
  # vc.restore()
  # print(vc.lines)
  # Output: ['def hello():\n', '\tprint(\'Hello, World!\')']
  
output:     
          log_file = open("log_file.txt", "r")
          lines = log_file.readlines()
          to_mark = self.mark-1
          
          if to_mark >= 0 and to_mark < len(lines):
              self.lines = eval(lines[to_mark].split(": ")[1].strip())
          else:
              raise ValueError("Invalid mark for restore")
          log_file.close()
  