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phrases with a certain mathematical sense.

To think a little before bed:

1. This sentence no verb.
2. When no one reads this sentence is in English.
3. This sentence contains an error.
4. Here begins the sentence that you're finished reading.
5. last words of this sentence are the words of this sentence.
   

Of course, the phrases are not mine, but I do not remember the authors, unless the second-appears on the book by Douglas Hofstadter Escher, Gödel, Bach. A graceful loop Eternal . A book everyone should read before you die.
Other se atribuyen a tanta gente que no he sido capaz de determinar su verdadero origen.