English Sudoku Cited by user RDBrown on 03 May 2023 Sudoku (数独; originally called Number Place) is a logic-based, combinatorial number-placement puzzle.
English Graph coloring Cited by user 150.143.226.57 on 18 Oct 2021 In graph theory, graph coloring is a special case of graph labeling; it is an assignment of labels traditionally called "colors" to elements of a graph subject to…