1. A system for combining ordinal information comprising: an information processing system having a memory and a processor; means for entering first ordinal information and second ordinal information, each of said first and second ordinal information including an ordinal sub-interval; and means for combining said first ordinal information and said second ordinal information over a time interval which is longer than said ordinal sub-interval for each of said first and second ordinal information by constructing at least one list having a selected ordinal sub-interval, said ordinal sub-interval for each of said first and second ordinal information being a multiple of said selected ordinal sub-interval.