Li Chen wrote:
> 
>> So the OP's technique, if not the prettiest, is actually by far the 
>> fastest, and is correct when used with nested arrays. Some of the other 
>> solutions (that use flatten) are incorrect when used with nested arrays.
> 
> What is meaning for OP here?
> 
> Thanks,
> 
> Li

Sorry, OP = original poster (that would be YOU :)

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