The conversation between human and AI assistant.
[|Human|] Classify each of the following as being opaque or transparent: Window, wall, lens, glass, wood, cement
[|AI|] Window: Transparent
Wall: Opaque
Lens: Transparent
Glass: Transparent
Wood: Opaque
Cement: Opaque
[|Human|] 
Classify each of the following as being opaque or transparent: Window, wall, lens, glass, wood, cement