Advent Sudoku

Rather than using the numbers 1-9, this sudoku uses the nine different letters used to make the words "Advent Calendar".

Problem



 

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Advent Sudoku



Like the conventional Sudoku, this Advent Calendar Sudoku consists of a grid of nine rows and nine columns subdivided into nine 3×3 subgrids. 

However, rather than containing the numbers 1 to 9, this sudoku contains the nine different letters which are used in the words "Advent Calendar". 

There are still two basic rules: 

1. Each column, each row, and each box (3×3 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 letter.