What is B2B2C2C2B in tourism e-commerce?

In e-commerce: b: commercial enterprises and manufacturers; Customers, consumers, individuals. 2: to

X2X means that one party makes a deal with the other party.

In tourism e-commerce: B2B: cooperative transactions between tourism enterprises, such as travel agencies and hotels. If you study tourism, then you should know that the cooperative transactions between travel agencies and hotels include, for example, the hotel gives the travel agency a lower room rate, and the travel agency promises to make a quantitative reservation for the hotel; B2C refers to tourism enterprises and general consumers, such as hotels and guests to stay, travel agencies and tourists; C2B: Consumers and tourism enterprises, such as tourists, join a tour group together, and then negotiate with travel agencies to see which travel agency will take over the tour group; C2C: Some transactions between tourists, such as the transfer of air tickets (I'm not sure about this, but I know it myself).