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The aliens invaded the planet Animal Farm and wiped out the commandments.
Napoleon
There are seven commandments in the beginning of Animal Farm. At the end there is only one commandment and that is, "All animals are equal, but some animals are more equal than others."
The animals felt they needed the seven commandments so order would be brought to the farm. The commandments would tell them what was and wasn't allowed.
page 134
The 7 commandments are a symbol of communism in Russian revolution.
Slowly change the 7 commandments until they are completely useless.
The ten commandments are a good example because of the amount of control it has over the animals
In George Orwell's Animal Farm, Benjamin reads the commandments to Clover whenever she is confused or unsure. Benjamin, the donkey, is known for being one of the most cynical and intelligent animals on the farm.
It is the pigs who changes the commandments to their convenience. Squealer is once found fallen of a ladder, and so it is believed that he does this at least once. This might also be because he is the one who is best at talking for himself.
Many animals on the farm could not remember all seven commandments so they shortened them to "Four legs good, two legs bad"
page 49 to 50 of the penguin modern classics book