With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Venice is a metropolis.
text_B: Shiazo -LRB- also known as Steam-Stones -RRB- is a substitute for hookah tobacco developed in Germany .. hookah. hookah. It consists of a porous mineral which soaks up vegetable glycerol and flavors to generate vapor rather than smoke , which is similar to how electronic cigarettes work .. mineral. mineral. glycerol. glycerol. electronic cigarettes. electronic cigarettes. The vapor is usually highly flavored .. Shiazo is supposed to be a healthier alternative to smoking and may be used inside public buildings even after the smoking ban in the European Union , United Kingdom in particular .. smoking ban. smoking ban. United Kingdom. United Kingdom
not_related.