Let me test a sample input. Suppose the input is "Alice walked quickly through the park." Proper nouns here is "Alice," so we leave it. "walked" could be trodded. "quickly" as rapidly. "through" as via. "the" as a maybe? Though "the" is an article and might not have three useful synonyms. Maybe a as placeholders? The user might expect that.
Also, the user mentioned "proper nouns" not to touch. So any words that are capitalized and refer to specific names should remain. Words like "Apple" in a sentence about the company should stay, but "apple" as a fruit would be replaced. Japan Cute 2 -Anak Sekolah Diperkosa di Toilet-
The precipitate chocolate reynard jumps over the lazy hound. Let me test a sample input
I should also note that the output should be concise, text-only, no markdown. So after processing each word, replace it with the three synonyms in the specified format. "quickly" as rapidly