Abstract: Disclosed is encoding and accessing a single data set of solution values functionally related to and representing the solution set to at least two domains of a variable, involving defining a single data set of solution values functionally related to a first domain of a variable and to a second domain of a variable, arranging said data set of solution values in an order related to said first domain and said second domain, accessing said data set of solution values relative to respective values in said first domain to derive at least a part of said solution set to said first domain, accessing said data set of solution values relative to respective values of said second domain to derive at least a part of said solution set to at least said second domain.