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Logik / Mengenlehre

In Honor of Professor Chong Chitat on His 60th Birthday

"The Mathematical Recreations of Lewis Carroll for Childs"

A Philosophical and Cognitive Analysis

500 Hard Sudoku Puzzles Overlapping into 100 Samurai Style

500 Puzzles & 12 Puzzle Types (Sudoku, Fillomino, Battleships, Calcudoku, Binary Puzzle, Slitherlink, Sudoku X, Masyu, Jigsaw Sudoku, Minesweeper,..

500 Medium to Very Hard

500 Easy to Hard Puzzles & 12 Puzzle Types (Sudoku, Fillomino, Battleships, Calcudoku, Binary Puzzle, Slitherlink, Sudoku X, Masyu, Jigsaw Sudoku,..

500 Easy to Hard

500 Medium Jigsaw Sudoku Puzzles Overlapping into 100 Samurai Style

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