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C=\{0134,0223,1402,1431,1444,2123,2234,3002,3310,4010,4341\} is a 5-ary 2-covering code of length 4.<ref>P.R.J. Östergård, Upper bounds for q-ary covering codes, ''[[IEEE Transactions on Information Theory]]'', 37 (1991), 660-664</ref>
== Covering
The [[determination]] of the minimal size <math>K_q(n,R)</math> of a q-ary R-covering code of length n
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