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The first hint to crack the puzzle "It is responsible for people's happiness" is:

It is a word which contains 9 letters

         

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The second hint to crack the puzzle "It is responsible for people's happiness" is:

It starts with letter s

s         

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The third hint to crack the puzzle "It is responsible for people's happiness" is:

It ends with letter n

s         n

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Looking for extra hints for the puzzle "It is responsible for people's happiness"
s         n
Click on any empty tile to reveal a letter

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The answer for the puzzle "It is responsible for people's happiness" is:
s e r o t o n i n

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