On Wed, 20 May 2009, Steven Taylor wrote:
>    6!:2 'b=.+/ a'
> 0.240794
>    6!:2 '(+/ % #) a'
> 0.13628

I think that 'a' is already cached when executed the tacit. You can
compare
   (100) 6!:2 'b=.+/ a'
   (100) 6!:2 '(+/ % #) a'

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