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<p>name, now usually called <b>Directed Hamiltonian cycle</b>)<br/>
***** <b><a href="page.php?w=Hamiltonian_path_problem">Undirected Hamilton circuit</a></b> (Karp's name, now usually called <b>Undirected Hamiltonian cycle</b>)<br/>
** <b><a href="page.php?w=Boolean_satisfiability_problem">Satisfiability with at most 3 literals per clause</a></b> (equivalent to 3-SAT)<br/>
*** <b><a href="page.php?w=Graph_coloring">Chromatic number</a></b> (also called the <a href="page.php?w=Graph_coloring">Graph Coloring Problem</a>)<br/>
**** <b><a href="page.php?w=Clique_cover">Clique cover</a></b><br/></p><p>
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