1. A computer-implemented method for comparing a first set of documents to a second set of documents, the method comprising: identifying, using a computer-implemented device, the first set of documents based on a first criterion; identifying, using the computer-implemented device, the second set of documents based on a second criterion, where the second criterion is different from the first criterion; constructing a matrix using the computer-implemented device, the matrix containing information regarding pairs of documents from the first and second sets of documents, where constructing the matrix further comprises: mapping, using the computer-implemented device and to each of the pairs of documents, a value representative of a number of lines that are common to both documents in each of the pairs of documents, where each of the pairs of documents comprises a document from the first set of documents and a document from the second set of documents, and excluding, using the computer-implemented device, a pair of documents from the matrix, when the documents, in the pair of documents, differ in size by at least a particular amount; calculating similarity scores, using the computer-implemented device, for each of the pairs of documents based on the matrix, where the similarity score is calculated for a pair of documents, of the pairs of documents, by: determining a first ratio of the number of lines that are common to the pair of documents and a number of lines of a first document of the pair of documents, determining a second ratio of the number of lines that are common to the pair of documents and a number of lines of a second document of the pair of documents, where the first ratio is different than the second ratio, selecting the first ratio or the second ratio as a selected ratio, and determining the similarity score based on the selected ratio; and outputting the similarity scores, using the computer-implemented device.