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The first hint to crack the puzzle "So easy to operate that it's impossible to go wrong" is:

It is a word which contains 9 letters

         

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The second hint to crack the puzzle "So easy to operate that it's impossible to go wrong" is:

It starts with letter f

f         

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The third hint to crack the puzzle "So easy to operate that it's impossible to go wrong" is:

It ends with letter f

f         f

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Looking for extra hints for the puzzle "So easy to operate that it's impossible to go wrong"
f         f
Click on any empty tile to reveal a letter

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The answer for the puzzle "So easy to operate that it's impossible to go wrong" is:
f o o l p r o o f

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