Read commands on a mirrored memory computer system are scheduled by utilizing information about pending memory access requests. The methods involve once daily topically applying to an affected skin area a topical composition containing ivermectin and a pharmaceutically acceptable carrier. One phonetic description is formed from the text of the word. The electron beam apparatus provided with the above spacer is excellent in display definition and long-term reliability since the display of light emission points and the creeping discharge accompanying the static electricity can be restricted due to the spacer. The oscillator varies a frequency of a periodic output signal within a frequency range in response to changes in a control voltage.