text: #usage: pyhton3 example.py
  
  from CYK_Paser import Grammar
  
  g = Grammar('example_grammar1.txt')
  g.parse('astronomers saw stars with ears')
  g.print_parse_table()
  
  print('')
  print('')
  print('')
  
  g = Grammar('example_grammar2.txt')
  g.parse('she eats a fish with a fork')
  g.print_parse_table()
  
  print('')
  print('')
  print('')
  
  g = Grammar('example_grammar2.txt')
  g.parse('eats she fork a fish')
  g.print_parse_table()
  g.get_trees()
  
  
  