After a user instigated search returns results, an intention mining engine collects information from the natural user responses to the results. That is, a function f which is not a constant regarding the refractive index n of the cover layer, and constants t1, t2 determined based on an allowable value of an aberration in the cover layer are used to set the ranges of the thickness t of the cover layer to a range of ft1tft2. The circuit isolating means can be switched off to cut off power when equipments are not in use. Pigment Red 168 is excellent in storage stability and high in gloss. A method for conducting remote subsurface inspections from above is also disclosed. In cases where the rubbery polymer is synthesized by anionic polymerization utilizing a polar modifier it is difficult to attain a high level of coupling.