Here is search logs of 650,000 AOL users. It's very interesting to view search history of particular person and analyze his personality. Let's do it together! Read more about AOL search database scandal or view research papers on web searching.
substring
A subsequence, substring, prefix or suffix of a string is a subset of the symbols in a string, where the orer of the elements is preserved. In this context, the terms string and sequence have the same meaning.