Methods, systems, and apparatuses, including computer programs, for safely executing a native code module for an ARM 64-bit instruction set. A first storage device selectively coupled to the magnetic memory cell stores a voltage representing a state of the magnetic memory cell. In an embodiment, each of said plurality of pages is flexible. The oxygen layer in the ARC has less metallic properties than the nitrogen layers therein. Between the control valve and a first valve of at least two valves a cutoff valve is connected, through which the total control pressure provided above a switching threshold can be reduced to minimum control pressure acting at least on the first valve or to zero by means of the control valve. A surface normal to the belt bearing surface on each segment urges a belt from the tool onto a pulley as the pulley is turned.