With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: John Boyega is in Star Wars sequel trilogy.
text_B: Speleology or spelaeology -LRB- also spelled spelæology or spelaeology -RRB- is the scientific study of caves and other karst features , their make-up , structure , physical properties , history , life forms , and the processes by which they form -LRB- speleogenesis -RRB- and change over time -LRB- speleomorphology -RRB- .. karst. karst. speleogenesis. speleogenesis. The term speleology is also sometimes applied to the recreational activity of exploring caves , but this is more properly known as caving or potholing , or -LRB- not usually by participants -RRB- by the largely obsolete American term spelunking .. exploring. exploration. caving. caving. Speleology and caving are often connected , as the physical skills required for in situ study are the same .. caving. caving. in situ. in situ. In Romania , the term speology is used  : this is derived from a Greek word for cave , speos , rather than the Latin , spelaeum .. cave. cave. Speleology is a cross-disciplinary field that combines the knowledge of chemistry , biology , geology , physics , meteorology and cartography to develop portraits of caves as complex , evolving systems .. chemistry. chemistry. biology. biology. geology. geology. physics. physics. meteorology. meteorology. cartography. cartography
not_related.