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Clover Heart's happened in 2003.
Flyable Heart happened in 2009.
The Gas Heart happened in 1923.
Heart of the Alien happened in 1994.
Prism Heart happened in 2000.
Bionic Heart happened in 2009.
Arcana Heart happened in 2006.
Heart of China happened in 1991.
Steam-Heart's happened in 9801.
Heart of Africa happened in 1985.
Black Heart happened in 1991.
Carnage Heart happened in 1995.