Thirdly, it is difficult to handle the following two cases: 1) mentions with similar morphology but totally different meaning such as “ADA-SCID (adenosine deaminase deficiency)” and “X-SCID (X-linked combined immunodeficiency diseases”; and 2) mentions with significant different morphology but similar semantic meanings such as “kaplan plauchu fitch syndrome” and “acrocraniofacial dysostosis”. This evidence concerns the gene ADA and acrocraniofacial dysostosis.