| # | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
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| | UniverseAll the matter and space that exists. Age of the UniverseThe time elapsed since the singularity predicted by the Big Bang theory, estimated to be around 13 billion years. MathematicsIn a Venn diagram, everything that is outside the sets.
  
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