First, I need to make sure I understand the task correctly. For each word provided, I need to find up to three synonyms. Proper nouns, like names of people, places, or specific brands, should be skipped. The input isn't provided here, so I'm assuming the user will provide the words later. But since the example might be hypothetical, I'll proceed with common words to demonstrate.

Wait, but what if the user provides a word with only two common synonyms? Should I still list two or find another one? The instruction says "all words with 3 synonyms," so I should aim for three. If there aren't three, maybe mention it, but the user wants output text only. Hmm, perhaps in such cases, just list the available ones, but the user specified three. So maybe I have to find three even if they're a bit less common.

Another thing: the user wants the output text only, so each line is a set for one word. For proper nouns like "London," I skip them entirely.

But I need to ensure that each set has exactly three synonyms. If there are fewer than three synonyms, I might have to adjust. But for the sake of the example, I'll stick with three unless there are not enough synonyms.

Let me try an example. If the input is "happy big run," the output should be:

Another consideration is checking the part of speech. If the word is a verb, the synonyms should also be verbs. The user didn't specify, so I'll assume they want the same part of speech. Also, some words have multiple meanings, but I'll pick the most common one.

Okay, let's see. The user wants me to convert each word in the input into a set of three synonyms, formatted like word1, skipping proper nouns. The output should only include text, no explanations or extra formatting.