You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: word_list.rb
    path of file: ./repos/birdwatcher/lib/birdwatcher
    
    the code of the file until where you have to start completion: module Birdwatcher
  class WordList
    attr_reader :options, :corpus, :word_list

    def initialize(opt
    
    def exclusion_list
      if !@exclusion_list
        @exclusion_list = options[:exclude_words] || []
        if options[:stopwords_file] && options[:exclude_stopwords]
          @exclusion_list += File.read(options[:stopwords_file]).split("\n").map do |w|
            w.strip.downcase
          end
        end