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'Advent Sudoku' printed from http://nrich.maths.org/
Like the conventional Sudoku, this Advent Calendar Sudoku consists
of a grid of nine rows and nine columns subdivided into nine 3x3
However, rather than containing the numbers 1 to 9, this sudoku
contains the nine different letters which are used in the words
There are still two basic rules:
1. Each column, each row, and each box (3x3 subgrid) must have each
of the nine letters (A, C, D, E, L, N, R, T, V).
2. No column, row or box can have two squares with the same