Wait, but "is" is a linking verb. Its synonyms might be "equals" but not sure how useful that would be in a sentence. So maybe in some cases, the synonyms won't fit grammatically, but the user just wants three any way. So proceed as such.

Putting it all together, the key steps are:

Let me check the example again. The user provided an example: each word with 3 alternatives using syn3 format. Suppose the input is a list of words. For example, input: "happy cat ran." The output would be joyous feline ran Wait, but "ran" can have synonyms like "raced," "dashed," so dashed.

speedy cat raced quickly

First, I need to process each word in the text. But wait, the user's example input is empty. Hmm, maybe they pasted the wrong text or forgot to include it. Without the actual text to work on, I can't proceed. However, perhaps the user is asking for a general example of how the output should look. The initial query says "Output text only," so maybe they want a sample response based on a hypothetical text.

In conclusion, the approach is to generate three synonyms per word using a thesaurus, format them correctly, skip proper nouns, and output as text. Since the input is missing, perhaps the user made a mistake, but assuming they want a sample, I'll proceed with a sample text.