Loop Checkpoint - "Title Case" exercise: Conditional logic not working; elsif condition was never met

gistfile1.rb

# Downcase everything to normalize
# 

require 'pry'

class Title
  
  attr_accessor :string
  
  def initialize(string)
    @string = string
  end
  
  def fix
    new_array = []
    working_array = string.downcase.split
    binding.pry

    working_array.each_with_index do |word, index|
      if index == 0
        new_array << word.capitalize
        binding.pry
      elsif word == ("the" || "or" || "and" || "of" || "a")
        new_array << word.downcase
        binding.pry 
      else
        new_array << word.capitalize
        binding.pry
      end
    end
    new_array.join(" ")
    binding.pry
  end
  
end

book = Title.new("The Sword and the Stone")
book.fix