I wrote:
>Do you prefer this?
>
>          vb5 =: #!.'0'~ ^!.0&0j1@:=&' '

Sorry, I was not careful in reading your (Raul's) original verb.  I think this 
is what you're after:

           vb5 =: #!.'0'~ 0j1 ^!.0  =&' '

-Dan

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