Brain Exercises for Memory: Eulero Puzzles - Large Print for Fun Travel: Brain Teaser Books, cartea 2

Eulero ("Graeco-Latin Square", "Euler Square") is a puzzle with letters and digits. The goal is to fill in the grid with symbols according to the following rules:
- Each cell contains one letter and one digit.
- Every row and every column contains each letter and each digit exactly once.
- No two cells contain the same pair of symbols.

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