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The first hint to crack the puzzle "Effect that can be observed in sirens or radar" is:

It is a word which contains 7 letters

       

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The second hint to crack the puzzle "Effect that can be observed in sirens or radar" is:

It starts with letter d

d       

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The third hint to crack the puzzle "Effect that can be observed in sirens or radar" is:

It ends with letter r

d       r

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Looking for extra hints for the puzzle "Effect that can be observed in sirens or radar"
d       r
Click on any empty tile to reveal a letter

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The answer for the puzzle "Effect that can be observed in sirens or radar" is:
d o p p l e r

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