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class Book
attr_reader :title, :author, :publisher, :year_published
def initialize(title, author, publisher, year_published)
@title=title
@author=author
@publisher=publisher
@year_published = year_published
end
def is_titled?(title)
@title == title
end
def ==(other)
other.kind_of?( Book ) && @title == other.title && @author == other.author && @publisher == other.publisher && @year_published == other.year_published
end
end
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