Answer:
The four details included by Orwell to support the idea that Snowball uses his language skills to manipulated the other animals are:
“After much thought Snowball declared that the Seven Commandments could in effect be reduced to a single maxim, namely: ‘Four legs good, two legs bad.’”
“‘A bird's wing, comrades,’ he said, ‘is an organ of propulsion and not of manipulation. It should therefore be regarded as a leg.’”
“The birds did not understand Snowball's long words, but they accepted his explanation, and all the humbler animals set to work to learn the new maxim by heart.”
“This, he said, contained the essential principle of Animalism. Whoever had thoroughly grasped it would be safe from human influences.”
Step-by-step explanation:
"Animal Farm" is an allegorical novella by author George Orwell in which he criticizes the Soviet regime in Russia. The animals and their revolution serve as representatives of the Russian people, the rulers, and the communist revolution.
The pigs, including Snowball, are the most intelligent animals on the farm. It is only natural that, after the revolution, they would be placed in charge of governing the other animals. However, precisely because the other animals are more limited in their mental capacities, it is easy for the pigs to start manipulating them. Snowball, who even learns how to read, has quite a well developed language skill which he uses to exert control. Since he sounds so intelligent and knowledgeable, the animals accept his words and ideas without putting up much of a fight. The four details mentioned above are proof of that.