We consider the mappings of a set of words into itself, and describe the injective mappings which do not propagate such errors as alteration of letters in words, the bijective mappings which do not propagate such errors as deletion of letters, and the injective mappings which do not propagate the errors of the above two types.
We consider the distribution of the sum of independent random variables which take their values from a primary cyclic group and are uniformly distributed on sets of identical cardinality.
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