A composite resonance circuit is provided of which the resonance frequency is variable over a wide frequency range without changing the circuit constant of a non-resonant element having no resonance frequency. At least the distal end and the curve are sized for passage through the opening into an interior space of the trachea of the patient. Because the three members are complementary and interdependent on each other the user often feels a sensation of weightlessness similar to exercising in water. Thus, the light source appears as if the LEDs became luminous around the central position of the light source in any lamp lighting mode. These catalysts show an improved activity with respect to known catalysts, wherein different aluminium compounds are used. The system is able to learn, incorporating site specific data into a triaging set.