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- 13:23, 1 December 2015 (diff | hist) . . (+9) . . User talk:Alois P. Heinz (→A123441 Number of P_4-sparse perfect graphs)
- 13:08, 1 December 2015 (diff | hist) . . (+909) . . User talk:Alois P. Heinz (→A123441 Number of P_4-sparse perfect graphs: new section)