One of them is the pigs use language and propaganda as tools. The second one is only the pigs are able to read and write. The second one is phrased kind of vaguely because all of the animals learn how to read throughout the book. However, the pigs can read fluently. All of the other animals can only read bits and pieces.
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The developed ideas that are important from chapters 3 and 4 are "the pigs use language and propaganda as tools" and "only the pigs are able to learn to read and write."
"The pigs, for example, use language and propaganda as instruments. The second point is that only pigs can write and read."
Because all of the animals learn to read during the book, the second one is phrased a little loosely.
The pigs, on the other hand, are excellent readers. All of the other animals can only read snatches of information.
Therefore, options three (3) and four (4) are the developed ideas in the chapters.
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