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Self-Referential Sentences

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Produced by Andy Burbanks. Good explanation with examples.
site exerpt
Self-referential sequences  The following is adapted from an idea presented by Douglas Hofstadter in his wonderful book Metamagical Themas. A Very Peculiar Sentence Can you see anything special about the following sentence? In this sentence, the number of occurences of 0 is...
http://info.lut.ac.uk/departments/ma/gallery/selfref/index.html

Exhaustive lists of "This sentence has three a's" sentences.
site exerpt
Self-Referential Sentences  Base Ten Sentences has Base Ten Sentences contains Base Ten Sentences there are Base Ten Sentences is composed of Base Ten Sentences incorporates Base Ten Sentences includes Base Ten Sentences consists of Base Ten Sentences employs Base Ten Sentences makes...
http://home.att.net/~rhhardin/selfref.html

The object of this difficult puzzle is to make four sentences mutually truthful by filling in base three numbers.
site exerpt
Solve my base three numerical self-referential sentences puzzle!  Solve my base three numerical self-referential sentences puzzle! Jennifer Franklin of Ottawa, Canada was the first to solve this puzzle. Franklin submitted her solution on October 29, 1998. This page was created in March 1997. I'm surprised that a year...
http://www.ddewey.net/puzzle/