A guide groove including a groove section extending from the vicinity of an entrance of a main passage to a side opposite the entrance is formed on the inner circumferential surface of a main passage. The preferred system and method divides the software or other data to be distributed into a separate licensing module and a program module, with each module being distributed separately. In a particular embodiment, the top-side flow obstructer and the bottom-side flow obstructer each include a curtain constructed from a flexible fabric having a plurality of individual adjacent fingers. The hair dryer holder is connected to an adjustable arm which contains a vertical pivot connection that allows for manual angular adjustment and affixation of the hair dryer about a generally horizontal pivot axis. The plurality of segments may be predicted by using different context pixels, and the second color component block may be encoded and decoded based on the predicted plurality of segments. When the adjusting ring is disposed in a first-direction position or a second-direction position, two of the pawls engage the ratchet wheel so as to allow for rotation of the ratchet wheel on the rotary seat in only a corresponding direction.