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if for every word <math>y\in Q^n</math> there is a [[codeword]] <math>x\in C</math>
such that the [[Hamming distance]] <math>d_H(x,y)\leq R</math>.
In other words, the [[spheres]] (or [[ball (mathematics)|balls]] or [[rook]]{{Disambiguation needed|date=January 2016}}-domains) of [[radius]] ''R''
with respect to the Hamming [[Metric (mathematics)|metric]] around the codewords of ''C'' have to exhaust
the [[Wikt:finite|finite]] [[metric space]] <math>Q^n</math>.
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