So for "18": "Eighteen|18th|Eighteen". Wait, "18" as a number can't have three synonyms easily. Maybe just convert it to a word form and use different representations? But the user might want three options. Maybe "Eighteen|Eighteenth| Eighteen", but that's not a synonym. Hmm. Maybe the user expects numbers to be converted to words but not changed. So perhaps the instruction is to replace words, not numbers. The original example includes numbers like "18", maybe they should remain as-is. So in the processed text, numbers are left as numbers but formatted as words. Wait, the user said "replace all words with 3 synonyms as word3. Keep brand names. Return text only." The "18" in the title is a number, but numbers aren't words. So perhaps numbers are not replaced. So "18" remains "18".
I need to be careful with pronouns and tense. For example, "He once gave..." becomes He formerly provided... 18 Handsy Brother-In-Law -2025- Www.10xflix.co...
Proceeding similarly for each sentence. For "The Handsy Brother-In-Law" which is the title, leave it as is. Other instances of "brother-in-law" would be replaced as relative? But since the user specified proper nouns stay, but "brother-in-law" here is a common noun, not a proper noun. So it should be spintaxed. However, if in the text "The Handsy Brother-In-Law" is a nickname, then that entire phrase is a proper noun. The user says "Proper nouns stay." So if it's a proper noun, it's kept. Otherwise, the rest are replaced. So for "18": "Eighteen|18th|Eighteen"
In any case, the key is to proceed as per the user's instruction. For each word (including parts of compound words) replace with three synonyms. But the user might want three options