| R | O | U | N | D |
| + | D | O | O | R |
| K | N | O | W | N |
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Would you like to see the solution?
The rules for cryptarithm puzzles are simple. Each letter represents one of the digits 0 to 9. Different letters represent different digits. The first digit in a number can't be 0. Your job is to find out what digit each letter represents. Can you solve the puzzle shown here?