Clarke MM has lots of them.
This scenario explains why it is useful:
The main problem is "Asthma", so I choose from the list Asthma and assign a priority. After analysis it checks the Clarke MM and compares my pathological symptoms with that of the result and highlights all occurrences. These will be persisted in the Database and after that, whenever I repeat Analysis, the occurrences will be highlighted too. After the problem is gone, the operator can lower the priority from "acute" to "solved". Should these tags reappear, they can be regarded as a potential problem.