With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Gwen Stefani does concerts with the Harajuku Girls.
text_B: The sanshin -LRB- 三線 , literally `` three strings '' -RRB- is an Okinawan musical instrument and precursor of the Japanese shamisen .. :ja :三線. musical instrument. musical instrument. shamisen. shamisen. Often likened to a banjo , it consists of a snakeskin-covered body , neck and three strings .. banjo. banjo. snakeskin. snakeskin
not_related.