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Decodable text is a type of text often used in beginning reading instruction. Decodable texts are carefully sequenced to progressively incorporate words that are consistent with the letters and corresponding phonemes that have been taught to the new reader.
A code is uniquely decodable if its extension is § non-singular.Whether a given code is uniquely decodable can be decided with the Sardinas–Patterson algorithm.. The mapping = {,,} is uniquely decodable (this can be demonstrated by looking at the follow-set after each target bit string in the map, because each bitstring is terminated as soon as we see a 0 bit which cannot follow any ...
In contrast, locally decodable codes use a small number of bits of the codeword to probabilistically recover the original information. The fraction of errors determines how likely it is that the decoder correctly recovers the original bit; however, not all locally decodable codes are locally testable. [1]
Locally decodable codes can also be concatenated, where a message is encoded first using one scheme, and the resulting codeword is encoded again using a different scheme. (Note that, in this context, concatenation is the term used by scholars to refer to what is usually called composition; see [5]). This might be useful if, for example, the ...
For example, a code with code {9, 55} has the prefix property; a code consisting of {9, 5, 59, 55} does not, because "5" is a prefix of "59" and also of "55". A prefix code is a uniquely decodable code: given a complete and accurate sequence, a receiver can identify each word without requiring a special marker between words. However, there are ...
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A locally decodable code is a code that allows a single bit of the original message to be recovered with high probability by only looking at a small portion of the received word. A code is q {\displaystyle q} -query locally decodable if a message bit, x i {\displaystyle x_{i}} , can be recovered by checking q {\displaystyle q} bits of the ...