It is often possible to save storage space in a computer by storing only the differences among data items rather than the entire items. For example, suppose we have two records A and B. We should store all of A, then for B store a pointer to A and the differences between A and B. If A and B are similar, there will be few differences and storage space can be saved.
['Kang', 'Lee', 'Chin-Liang Chang', 'Shi-Kuo Chang']
Storage Reduction Through Minimal Spanning Trees and Spanning Forests