A device comprising a diblock copolymer mask for fabricating a magnetoresistive random access memory includes a magnetic layer; a mask formed on the magnetic layer; a template formed on the mask; and the diblock copolymer mask, the diblock copolymer mask comprising a first plurality of uniform shapes formed on and registered to the template. Each transmission node receives feedback on first information as information regarding a transmission node that transmits an interference signal causing an interference-to-noise ratio greater than a first reference value from reception nodes, determines a group to which each transmission node belongs on the basis of the first feedback information, and allocates resources to each group. The material disposed within the supply well is pressed against the rotor by a supply arrangement which has at least two slides superimposed above each other and supplying the material to the rotor. In one locked position, the sleeve moves the locking dog to engage the wall. An injector is in communication with the propellant chamber.