With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Jeff Bezos's Blue Origin has test flights to space and they have gone well.
text_B: The Lukuga River is a tributary of the Lualaba River in the Democratic Republic of the Congo -LRB- DRC -RRB- that drains Lake Tanganyika .. Lualaba River. Lualaba River. Democratic Republic of the Congo. Democratic Republic of the Congo. Lake Tanganyika. Lake Tanganyika. It is unusual in that its flow varies not just seasonally but also due to longer term climate fluctuations .
not_related.