We also compare the present version of BioSimplify with the older version <cite>11</cite> which is limited in its functionality because it only implements the rules described by Siddharthan 4 . The present version which has an average time complexity of O(nlog(n)*R) is faster than the older version which has a time complexity of O(n 3 *R), where n is the number of tokens in the sentence and R is the number of rules. The older version has domain specific optimizations (like replacing the gene names with single-word identifiers), which were not used in the newer version for portability.