25. A compression method for compressing a plurality of data sets, each of the data sets containing a history context and a data set context, the method comprising: clustering similar history contexts from a data set to form a history context cluster; and clustering similar data set contexts into a data set context cluster which share the same history contexts clusters.
25. A compression method for compressing a plurality of data sets, each of the data sets containing a history context and a data set context, the method comprising: clustering similar history contexts from a data set to form a history context cluster; and clustering similar data set contexts into a data set context cluster which share the same history contexts clusters. 26. The invention as set forth in claim 25, wherein: clustering similar history contexts further comprises using a clustering technique to determine which history contexts are similar.