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Starting with the first part: "Power System Control: Control of power systems, including voltage control and frequency control." The word "Control" could be replaced with control. "power systems" might stay as is, but "including" could become comprising. "voltage control" and "frequency control" are technical terms, so maybe just replacing "control" with the alternatives here as well.

Starting with the first part: "Power System Analysis by T.K. Nagsarkar: A Comprehensive Guide". "Power System Analysis" is a title, so it's a proper noun. "T.K. Nagsarkar" is the author's name, definitely a proper noun. "A Comprehensive Guide" is a subtitle, so maybe that's also a proper noun since it's part of the title. But not sure. The user says "proper nouns stay," so I'll leave those as they are. Starting with the first part: "Power System Control:

1. Split the text into words. 2. Identify proper nouns (titles, names) and mark them as unchanged. 3. For each word not in a proper noun, generate three options. 4. Format the output with and | separators. Starting with the first part: "Power System Analysis by T