With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Bran Stark is a fictional person in books by a novelist from the United States.
text_B: A push-button -LRB- also spelled pushbutton -RRB- or simply button is a simple switch mechanism for controlling some aspect of a machine or a process .. switch. switch. machine. machine. process. Process ( engineering ). Buttons are typically made out of hard material , usually plastic or metal .. plastic. plastic. metal. metal. The surface is usually flat or shaped to accommodate the human finger or hand , so as to be easily depressed or pushed .. Buttons are most often biased switches , although many un-biased buttons -LRB- due to their physical nature -RRB- still require a spring to return to their un-pushed state .. biased switches. Switch#Biased switches. spring. Spring ( device ). Different people use different terms for the `` pushing '' of the button , such as press , depress , mash , hit , and punch .
not_related.