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𝟬. 𝗦𝗢𝗖 (𝘀𝗲𝗽𝗮𝗿𝗮𝘁𝗶𝗼𝗻 𝗼𝗳 𝗰𝗼𝗻𝗰𝗲𝗿𝗻𝘀): Keep different parts of your program distinct and focused. When each module has a single responsibility, adding or removing code becomes easy.