Classify each of the following as being opaque or transparent: Window, wall, lens, glass, wood, cement
Window: Transparent
Wall: Opaque
Lens: Transparent
Glass: Transparent
Wood: Opaque
Cement: Opaque
<START_INST>Classify each of the following as being opaque or transparent: Window, wall, lens, glass, wood, cement<END_INST><START_CTX><END_CTX><START_A>Window: Transparent
Wall: Opaque
Lens: Transparent
Glass: Transparent
Wood: Opaque
Cement: Opaque<END_A>