Correct Answer - Option 3 : UNAL
The logic is:
L
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U
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N
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A
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A
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L
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U
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N
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N
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A
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L
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U
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U
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N
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A
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L
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If we write the letter at the extreme right end of the first word and then the same letters from the left end, we get the second cluster of letters.
Repeating this pattern, we get 'UNAL' will complete the series.
Hence, ‘UNAL’ is the correct answer.