What is the only set of prime triplets?

Could you elaborate on what you mean by "prime triplets"? Are you referring to a specific sequence of three prime numbers that share a unique property, perhaps being consecutive or having some other mathematical relationship? If so, could you please clarify which specific set of prime triplets you're referring to as "the only one"? It's important to note that there are numerous sets of prime triplets, depending on the criteria you use to define them. For instance, (3, 5, 7) is a well-known set of consecutive prime triplets, but there are others that meet different criteria. Could you please provide more context or clarification to help me answer your question more accurately?