Martin Gardner Quote

The Polybius Checkerboard Polybius was an ancient Greek writer who first proposed a method of substituting different two-digit numbers for each letter. The alphabet is written inside a 5–by–5 square matrix which has numbered rows and columns:

Martin Gardner

The Polybius Checkerboard Polybius was an ancient Greek writer who first proposed a method of substituting different two-digit numbers for each letter. The alphabet is written inside a 5–by–5 square matrix which has numbered rows and columns:

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