With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Lightning rods are made of materials with certain properties.
text_B: A lightning rod -LRB- US , AUS -RRB- or lightning conductor -LRB- UK -RRB- is a metal rod mounted on a structure and intended to protect the structure from a lightning strike .. American English. AUS. Australian English. British English. metal. metal. lightning. lightning. If lightning hits the structure , it will preferentially strike the rod and be conducted to ground through a wire , instead of passing through the structure , where it could start a fire or cause electrocution .. lightning. lightning. electrocution. electrocution. Lightning rods are also called finials , air terminals or strike termination devices .. In a lightning protection system , a lightning rod is a single component of the system .. lightning. lightning. The lightning rod requires a connection to earth to perform its protective function .. lightning. lightning. Lightning rods come in many different forms , including hollow , solid , pointed , rounded , flat strips or even bristle brush-like .. The main attribute common to all lightning rods is that they are all made of conductive materials , such as copper and aluminum .. lightning. lightning. copper. copper. aluminum. aluminum. Copper and its alloys are the most common materials used in lightning protection .. lightning. lightning
related.