Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Wizard:  In a universe chock full of planet busters , Majin Buu is one of the strongest . He 's destroyed entire galaxies by systematically obliterating each planet one by _ one _ over time .
Boomstick: He 's defeated most of Dragonball Z 's most powerful characters , including Vegeta , Gotenks , and Gohan .
Wizard: He one - shot the king of the demon realm , and easily bested the Supreme Kais .
Boomstick: Who are like the gods of other gods , so needless to say , Buu is pretty frickin ' strong .
Wizard: But he 's also extremely cocky , caring little about strategy or personal safety , and while his regenerative ability seems to make him indestructible , Buu is one of the only Dragonball characters who 's body has been visibly affected by ordinary bullets .
Boomstick: And while being able to destroy planets , his body 's not tough enough to take the explosion , forcing him to regenerate from a mass of pink particles .
Wizard: Despite having the mind of a child and the body of Play - Doh , Majin Buu might just be the deadliest villain in Dragonball history .

planet