1. A method for encoding an input sequence of symbols, the symbols belonging to a finite alphabet, wherein a context model specifies a predefined probability set, and wherein each symbol of the input sequence of symbols is associated with a probability from the predefined probability set on the basis of the context model, the method comprising: selecting a new probability set, wherein the new probability set is not identical to the predefined probability set; assigning each of the symbols of the input sequence a respective probability from the new probability set based upon a mapping, wherein the mapping maps each of the probabilities of the predefined probability set to a respective one of the probabilities from the new probability set; and entropy encoding the input sequence of symbols, wherein the entropy encoding includes grouping symbols on the basis of their respective assigned probabilities from the new probability set.