<s>[INST] In a medical experiment, a sample of blood from a healthy donor was first contaminated with a small portion of another blood sample with the "unknown virus". The contaminated blood was then put in a special machine, the so-called "virus eliminator", which is supposed to "clean" the contaminated blood using a special disinfecting wave technique. The machine has an effectiveness, E , equal to a value between 0 and 1.[/INST]