Good question Piet,

I needed to think a bit about how adverbs can be written tacitly. Others are 
considerably more advanced, but here goes:

    at=: 1 : '%:@:(u/) ' NB. Original adverb
   + at i. 8
5.2915
   a1t=: %:@:     NB. First part of adverb is also an adverb
   +/ a1t i. 8
5.2915
   a2t=: /        NB. Second part of adverb - obviously an adverb
   + a2t a1t i. 8
5.2915
   a3t=: / (%:@:) NB. Two adverbs together form a new adverb - parenthesis are 
required
   + a3t i. 8
5.2915            NB. Tacit "a3t" has the same result as explicit "at"

Cheers, bob
   
> On Jul 30, 2018, at 1:32 PM, Piet Google <[email protected]> wrote:
> 
> t=: 1 : '%:@:(u/) y'

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