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ost_uid0]It's Harry Potter talk. Sirius Black is an animagus who can turn into a black dog. Lumos is a spell to turn a staff into a flashlight. Priori incantatum is a spell to determain what spell another staff performed last.
You should try to read the books. Or at least the first one.
Quad Erat Demonstrandum (You should know that one, cat) or Cogito Ergo Sum?[/color

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