With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Harry Styles released an album in 2011.
text_B: Treak Cliff Cavern is a show cave near Castleton in Derbyshire , England .. show cave. show cave. Castleton. Castleton, Derbyshire. It is part of the Castleton Site of Special Scientific Interest and one of only two sites where the ornamental mineral Blue John is still excavated -LRB- the other is the nearby Blue John Cavern -RRB- .. Blue John. Derbyshire Blue John. Castleton. Castleton, Derbyshire. Site of Special Scientific Interest. Site of Special Scientific Interest. Blue John Cavern. Blue John Cavern. As part of an agreement with English Nature , the Blue John that can be seen in the show cave is not mined but it is extracted in small quantities from other areas of the cave and made into saleable items like bowls , jewellery and ornaments .. Blue John. Derbyshire Blue John. show cave. show cave. English Nature. English Nature. The cave comprises two sections , the Old Series , discovered by lead miners in the 18th century , and the New Series , discovered during blasting in the 1920s .. Only the Old Series contains Blue John , but the New Series is well decorated with flowstone , stalagmites and stalactites .. Blue John. Derbyshire Blue John. flowstone. flowstone. stalagmites. stalagmites. stalactites. stalactites. Three human skeletons and flint implements from the Neolithic era were found in a small cave nearby in 1921 .. Neolithic era. Neolithic era
not_related.