With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: South America contains at least five countries.
text_B: The 2013 Western Athletic Conference men 's soccer season is the eighth season of men 's varsity soccer in the conference .. The conference first sponsored the sport in 1996 , but after eight schools split from the WAC in 1999 to form the Mountain West Conference -LRB- MW -RRB- , the WAC only played the 1999 season before disbanding its men 's soccer league .. Mountain West Conference. Mountain West Conference
not_related.