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:: There are no more selected rows at level 2, thus the algorithm moves to the next branch at level 1.
: There are no more selected rows at level
The algorithm is complete.
In summary, the algorithm determines there is only one exact cover: <math>\mathcal{S}^*</math> = {''B'', ''D'', ''F''}.
== Implementations ==
[[Donald Knuth|Knuth]] further suggested an implementation of Algorithm X using circular [[doubly linked list|doubly-linked list]]s, which he calls [[Dancing Links]], or DLX.
== References ==
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