With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Challenge later got shortened to its current name.
text_B: A constitutional referendum was held in Guinea on 13 October 1946 as part of the wider French constitutional referendum .. Guinea. Guinea. French constitutional referendum. French constitutional referendum, October 1946. Although the proposed new constitution was rejected by 54 % of voters in the territory , it was approved 53 % of voters overall .
not_related.