With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Amsterdam was the leading centre for blue diamonds.
text_B: The Pennsic War is an annual American medieval camping event held by the Society for Creative Anachronism -- a `` war '' between two large regional SCA groups  : the Kingdom of the East and the Middle Kingdom .. Society for Creative Anachronism. Society for Creative Anachronism. medieval. medieval. It is the single largest annual SCA event , with more than 10,000 people attending each year , from as far as Sweden , Germany , France , Italy , Greece , and Australia .. Pennsic is held in late summer and lasts for 17 days -LRB- begins on a Friday , ends on the second Sunday -RRB- .. The event centers on pre-17th century history and culture with all campers dressing in medieval clothing .. medieval. medieval. The winners of the battles and other activities receive war points , and the Kingdom with the most war points wins that Pennsic .. The Pennsic War uses numbers to identify each war rather than the year it was held , so the 2011 event was known as `` Pennsic War 40 '' , there having been 39 previous events .
not_related.