With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Ethiopia has highlands.
text_B: Make Money Fast -LRB- stylised as MAKE.MONEY.FAST -RRB- is a title of an electronically forwarded chain letter which became so infamous that the term is now used to describe all sorts of chain letters forwarded over the Internet , by e-mail spam or Usenet newsgroups .. chain letter. chain letter. Internet. Internet. e-mail spam. e-mail spam. Usenet. Usenet. In anti-spammer slang , the name is often abbreviated `` MMF '' .
not_related.