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== A[n,d] ==
The trade-off between efficiency (large information[[code rate]]) and correction capabilities can also be seen from the attempt to, given a fixed codeword length and a fixed correction capability (represented by the [[Hamming distance]] d) maximize the total amount of codewords. ''A[n,d]'' is the maximum number of codewords for a given codeword length n and Hamming distance d.
 
== Information rate ==