The first hint to crack the puzzle "This country's flag is the oldest in the world" is:

It is a word which contains 7 letters

The second hint to crack the puzzle "This country's flag is the oldest in the world" is:

It starts with letter d

The third hint to crack the puzzle "This country's flag is the oldest in the world" is:

It ends with letter k

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The answer for the puzzle "This country's flag is the oldest in the world" is: