New etch barriers of indium-tin-oxide in the manufacturing process of thin film transistor-liquid crystal display are self-assembled monolayers, such as n-alkylsilanes. The system includes a sheath with a utility lumen and an energy delivery section at least partially constructed from a material which transmits ultrasound energy. The light reflecting units according to the present invention can guide the light from the sides of light guiding strips or other light not toward the right side of the illumination module back to the right side of the illumination module, and thus improving the light output efficiency and uniformity. The computed value may be used for selecting the subset of keywords from the master keywords andor ranking the master keywords.