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Soft sleeper and soft seat are two different classes of train tickets in China. Soft sleeper is a type of train ticket that provides a fully enclosed sleeping compartment with four bunks, while soft seat is a type of ticket that provides a more spacious and comfortable seat compared to hard seat. The availability of soft sleeper and soft seat tickets depends on the train route and the type of train. Soft sleeper tickets are generally more expensive than soft seat tickets, and are a popular choice for overnight train journeys.