I want to know the answer to the following question:
For how many years did the Warsaw Pact formally exist?
All the background I'm provided with is that "On 1 July 1991, in Prague, the Czechoslovak President Václav Havel formally ended the 1955 Warsaw Treaty Organization of Friendship, Cooperation, and Mutual Assistance and so disestablished the Warsaw Treaty after 36 years of military alliance with the USSR.". Is that enough to answer the question?