Arrange 7's to 1

You need to arrange three 7 and mathematical symbols to form number 1?




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Detective John was investigating a murder in China.
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This is the newspaper advert (Car licence plates for sale) that Detective John saw.

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[W 05 NWO]
[H 13 HSR]
[O 05 EBM]
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[I 26 LHC]
[T 10 AEE]
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How many did you count?

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There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.