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The word over the alphabet {,} obtained by taking the first difference of the Thue–Morse sequence is an example of an infinite square-free word. [9] [10] The patterns and are unavoidable on any alphabet, since they are factors of the Zimin words. [11] [1]
The C grammar does not permit two consecutive ? tokens, so the only places in a C file where two question marks in a row may be used are in multi-character constants, string literals, and comments. This is particularly a problem for the classic Mac OS , where the constant '????' may be used as a file type or creator. [ 8 ]
The individual segments of a sixteen-segment display Arabic numerals, letters of the ISO basic Latin alphabet and punctuation on a typical 16-segment display. A sixteen-segment display (SISD) is a type of display based on sixteen segments that can be turned on or off to produce a graphic pattern.
Square-free words do not have adjacent repeated factors. [1] To clarify, "dining" is not square-free since "in" is repeated consecutively, while "servers" is square-free, its two "er" factors not being adjacent. Thue proves his conjecture on the existence of infinite square-free words by using substitutions. A substitution is a way to take a ...
The individual segments of a fourteen-segment display. A fourteen-segment display (FSD) (sometimes referred to as a starburst display or Union Jack display [1] [2]) is a type of display based on 14 segments that can be turned on or off to produce letters and numerals.
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Just as in the Roman alphabet, there are short letters (e.g. a, c, e, m, and n), written between the base writing line and the "upper parallel" (as Read calls it), tall letters (e.g. b, d, f, k, and t), which ascend above the top of the short letters, and deep letters (e.g. g, j, p and y), which descend below the base writing line. Quikscript ...
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