For example:

- Else, replace it with three variants separated by | inside curly braces.

So, the main task is to process each word, check if it's a proper noun, if not, generate three variants. Proper nouns remain as they are.

"Visit Paris and discover its

In the absence of input, the assistant probably needs to create an example. So let me create one. Let's say the input is "The quick brown fox jumps over the lazy dog." The output would process each word, skipping any proper nouns (none in this case), and replace each common word with three variants.

quick → fast