class_docstr: An abstract base class representing a corpus of words.
  Define the method _get_corpus in any derived class.
code: def __init__(self, name: str) -> None:
      self.name = name
      self.words = self._get_corpus()
  
imports: from abc import ABC, abstractmethod
  from typing import Dict, Iterator, List, Tuple
  import nltk
label_desc: Use image node_id 1 to create a new Corpus object from inherited base classes: ABC with example: obj = Corpus(name)