Soviet Ussr
Who can name the 6 leaders of the USSR and the Soviet Union 1922-1991?
All 6 of them, even those serving less than one year or a decade. No source using the Internet, in addition to you were incorrect Butterfly. I should say, 6-7, it was for one year, but you can leave it if you do not know.
Lenin Stalin Khrushchev Andropov Brezniv Gorbechov (I hope spelling does not count)