P452: Enumerate all maximal 6-colorable subgraph in a graph.

P452: Enumerate all maximal 6-colorable subgraph in a graph.
Input:
A graph $G = (V, E)$.
Output:
All maximal 6-colorable subgraphs in $G$.
Complexity:
$O(2.2680^{|V|})$ total time and $O(2^{|V|})$ space.
Comment:
Reference:
[Byskov2004] (Bibtex)