+Document snippets were used for deciding whether to download the document for the text alignment.\r
+We used 2-tuples measurement, which indicates how many neighbouring word pairs coexist in the snippet and in the suspicious document.\r
+Performance of this measure is depicted at picture~\ref{fig:snippet_graph}.\r
+Having this measure, a threshold for download decision needs to be set in order to maximize all discovered similarities\r
+and minimize total downloads.\r
+A profitable threshold is such that matches with the largest distance between those two curves.\r