With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The German Revolution caused the Kingdom of Prussia to be replaced by a new government.
text_B: Irina Devina -LRB- Ирина Девина born 8 May 1959 in Zhukovsky , Moscow Oblast Russia SSR , Soviet Union -RRB- is retired Soviet rhythmic gymnast who has competed both as an individual and in group .. Russia SSR. Russia SSR. Zhukovsky. Zhukovsky, Moscow Oblast. Soviet. Soviet. rhythmic gymnast. Rhythmic gymnastics. She is a -LRB- 1979 , 1977 -RRB- World Champion in Group all-around and won the 1981 USSR Championships in all-around .. World Champion. World Rhythmic Gymnastics Championships
not_related.