A document sorting device comprises a popularity degree calculation unit and a popularity degree transition calculation unit. The device includes biocompatible materials and has specific characteristics that allow the device to elicit less of a fibrotic reaction after implantation than the same device lacking one or more of these characteristic that are present on the device. The bottom plate located under the optical elements. The decoder is to decode a first and second set of instructions that each specify one or more registers in the architectural register file. At least one security action associated with a second security level is performed in response to the existence of a second context associated with the second security level. Displacement bodies are inserted into pipes which are flowed around by hot process gas.