With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Unpredictable had a song called Congratulations.
text_B: East Yi West Xia -LRB- Yi Xia Dong Xi Shuo , 夷夏東西說 -RRB- is an obsolete theory about the origin of prehistory culture in current China which says that the culture of Shang dynasty was established by two ethnic groups ; Western part of Shang dynasty was developed by Xia ethnic group , and the eastern part of Shang dynasty was developed by Yi ethnic group .. Shang. Shang
not_related.