Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

[EX Q]: the tornado outbreak sequence of june 1966 was a series of tornado outbreaks which happened between june 2 and june 12.
[EX A]: tornado outbreak sequence of june 1966

[EX Q]: the diamond cutter is a wrestling finishing move done by the wrestler diamond dallas page.
[EX A]: diamond cutter

[EX Q]: malva is a genus of about 25-30 species of plants commonly called mallows.
[EX A]:
malva