As a special case, if E consists of two event types A and B, it decomposes into A and B provided ??{A,B}(s)=??A(s A)?????B(s B),???s??F (A,B). (6) [0102] I.e., the occurrence probability of a sequence of A's and B's is the product of the probability of seeing the A's and probability of seeing the B's. [0103] Finding Independent Components from Observed Sequences [0104] Our goal is to start from ob