Abstract: The encoding method is adapted to the recognition of synchronization words in sequence of variable length encoded words, each encoded word corresponding to a specific message or event from a sequences of messages each assigned with a probability of occurrence. The method consists in constructing a dichotomizing encoding tree comprising a specific number of leaves (F1 . . . F4) distributed over priority levels (n.sub.1 . . . n.sub.4) classified in a decreasing order on processing from the root of the tree towards the leaves, the number of leaves being equal to the number of events to be encoded, in placing the leaves adjacent to one another on each level, the leaves corresponding to the most probable events being placed at one end to the right or to the left on each level, and in prohibiting, in the encoded words, the sequences of Smax bits of equal value, zero or one, in order to obtain an easy choice of synchronization words.

Abstract: Cosmetological or dermatological compositions for skin care, principally comprising a mixture comprising:(A) an extract of Silybum marianum fruits rich in Silymarine referred to as "Absolute Hawthorn",(B) one or more essential polyunsaturated fatty acids containing 18-22 atoms of carbon having only:either in the free form (1),or in the form of salts of an alkaline metal or ammonium (2),or in the form of triglycerides (3),or in the form of a mixture constituted by two of the three forms (1), (2), and (3), or by the three forms (1), (2), and (3).