The invention provides a composition that significantly shortens the time necessary to produce a ceramic shell mold. Even when an epitaxial layer having a dopant concentration of 1\xd71019cm3 or more is formed on the main surface of the silicon single crystal substrate, stripe-shaped surface irregularities on the epitaxial layer are inhibited. Preferably the signals received from both sources are displayed simultaneously within different viewing windows at the screen of the TV device. Also provided is a second buffer light amplifying unit for amplifying a second signal light from a second transmission path and an amplified first signal light from the core light amplifying unit. The method further includes the steps of flattening the two collapsible sections, placing the flattened sections on top of one another, and storing the folded mattress in a cavity. Each ring is non-symmetrical with respect to at least one axis and has a longitudinal axis.