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The first hint to crack the puzzle "First to develop a polio vaccination" is:

It is a word which contains 9 letters

         

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The second hint to crack the puzzle "First to develop a polio vaccination" is:

It starts with letter j

j         

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The third hint to crack the puzzle "First to develop a polio vaccination" is:

It ends with letter k

j         k

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Looking for extra hints for the puzzle "First to develop a polio vaccination"
j         k
Click on any empty tile to reveal a letter

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The answer for the puzzle "First to develop a polio vaccination" is:
j o n a s s a l k

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