[Jprogramming] tacit adverb

[David Lambert]

Given that a, b, c, d, and u are verbs, and u is the "field replaceable" 
verb, produce this train:

(a b)~ ([: c [: d u)
Using two instances of evoke gerund,

   Adv=: ([:`c`[:`d`)(`:6)((a b)~`)(`:6)

   u Adv
(a b)~ ([: c [: d u)

Is there some clever way to write Adv with just one `: ?

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