"However" can be "However|Nevertheless|Nonetheless".
So the instruction is to replace every word with three synonyms. So maybe even if the word is a technical term, like "APK", if it's not a proper noun, replace it. But "APK" is an acronym, which might be considered a proper noun. Hmm. This is a bit confusing. Let me check the example given by the user. The user provided an example where they replaced "APK" with "APK|Android package|install file". So maybe in their example, they treated "APK" as a common noun and replaced it. So I'll follow that. FlutterMare APK 1.3.0 For Android.apk
"FlutterMare" is a proper noun, "Android" is proper. "APK" is a common noun. So "APK" can be replaced with synonyms like "installation|installer|install file". Wait, but "APK" is an Android package, so synonyms would need to be specific. Maybe "Androidpackagepackage"? Hmm, but the user wants three variants. Alternatively, maybe find three synonyms for "APK" in the context. However, in the context, "APK" refers to the Android application package. The word "APK" is not easily substitutable with another term without context. So perhaps "APK" should be left as is, but the user wants every word to be changed. Wait, the instruction says "swap every word with 3 variants using syn1 format. No changes to proper nouns. Text only." "However" can be "However|Nevertheless|Nonetheless"
Next, "Comprehensive" can be replaced with "thorough|extensive|complete". "Review" can be "evaluation|assessment|analysis". "Download" can be "download|obtain|fetch". "Guide" can be "Tutorial", but "Guide" might have the indicating bold formatting. Wait, the user's example doesn't have markdown, just text. The user says "Text only." So maybe the is part of the text. So "Guide" becomes "Manual". But "APK" is an acronym, which might be
So moving on. Now, for each non-proper noun word, I need to find three synonyms. For example, "For" can be replaced with "For|for|For", but since "For" is capitalized in the title, maybe it's better to keep it as is if it's a title case. Alternatively, perhaps the user wants every word to be lowercased except the proper nouns. Wait, the user says "swap every word with 3 variants using syn2 format. No changes to proper nouns. Text only." So case doesn't matter? The text should be as is, but words are swapped with synonyms, keeping proper nouns. So the capitalization of the word is preserved, but the word itself is replaced with synonyms. So for example, "For" in the title can be replaced with "For|for|For", but since it's in the title, maybe the user wants to keep "For" capitalized. Hmm, the example the user provided has "For" replaced with "For|for|For", so the first variant is capitalized. So perhaps in the title, the word "For" is capitalized as part of the title, so in the output, the first synonym should also be capitalized. So "For" becomes "For", but the first one is capitalized. But I'm not sure. Maybe the user just wants the three variants regardless of case. Hmm.
"Features" can be "attributes|benefits|aspects".
This is a bit ambiguous, but given the example, I'll proceed with replacing each word with three variants in the syn1 format, keeping proper nouns as is, and adjusting case as needed.