Self ref

Puzzles

• self.ref.lettersConstruct a true sentence of the form: "This sentence contains _ a's, _ b's, _ c's, ...," where the numbers... Added material
• self.ref.numbersWhat true sentence has the form: "There are _ 0's, _ 1's, _ 2's, ..., in this sentence"?
• self.ref.sentencesWhat are some self-referential sentences? New
• self.ref.wordsWhat sentence describes its own word, syllable and letter count?