"P DF" → Document (but "PDF" is an abbreviation, maybe leave as is. Wait, the user said skip brands, which include PDF as a format is a standard abbreviation. Hmm. Maybe it's better to leave "PDF" as is. So PDF or just keep it. Alternatively, maybe use alternatives like "Format". Wait, but "PDF" is a specific file type. The user said to skip brands, so if "PDF" is considered a brand here, maybe it's a brand. However, PDF is a standard abbreviation for Portable Document Format, so it's a proper term. But the user says to skip brands and names. Since "PDF" is a file format created by Adobe, which is a brand, so maybe it's considered a brand. Therefore, "PDF" should be left as is. Similarly, "by Kumbhojkar PDF" – here "PDF" is part of the file name, so maybe it's part of the title. Let me check that instruction again: "Skip brands and names. Text only." So, yes, "PDF" is a brand if it's referring to Adobe's PDF. However, in the context, it's just the file type. This is a bit ambiguous, but the user might want to skip "PDF" as a brand. So, in that case, "PDF" would stay as is. But in the example, the user might have intended to replace all words except the title's proper nouns and the author's name. This requires careful consideration. But since the instruction is to skip brands and names, and "Kumbhojkar" is a name, "PDF" as part of the file type here may or may not be considered a brand. If it's a brand, leave it. If not, replace it. Since it's unclear, maybe proceed to replace all words except the author's name and the specific book title words. But the instruction is quite strict: every word with three synonyms as spintax w3. Skip brands and names. So, unless a word is a brand or name, replace it. Therefore, "PDF" as a file extension is an abbreviation and not a brand name, so it can be replaced with synonyms like "file|document|format". But that might not be accurate. Alternatively, since it's a specific file type, maybe leave it. This is a bit of a grey area, but I'll proceed with replacing it with similar terms.
"Understand": "Grasp|Comprehend|Perceive." Companion To Applied Mathematics 1 Kumbhojkar Pdf
"Improved" Improved, "understanding" understanding, "provides" supplies, "clear" convenient, "concise" terse, "principles" basics, "making" making, "easier" simpler. "P DF" → Document (but "PDF" is an
Wait, the sample only replaced some of those, but maybe it's better to follow the example. Let's check the sample again. In the sample, they changed "guide" to three options, "students" to three, and other words as needed. Let's replicate that approach. Maybe it's better to leave "PDF" as is