While Henry's solution is somewhat brilliant, dont overlook straightforward
 
   2 (- (2 : 'u@:v : (u v)') +:) 5

_8

which is your official replacement for missing ]. and [.
 
BTW, I always found gerund cases of } and ^: arbitrary, illogical and hard to 
remember.
For me "logical" would be something along the lines of:
 
1. Verbs inside gerund are applied monadically if composite verb is monadic 
context, dyadically otherwise.
2. 2 element gerunds create monadic case (g1} g2) and 3 element gerunds create 
dyadic case (g1 g2} g3)
 
Is there justification for actual case?
 
> From: Don Guinn <dongu...@gmail.com>
> 
> Thanks. Had not really understood the gerund form for Power until now.
> 
> On Friday, July 6, 2012, Henry Rich <henryhr...@nc.rr.com> wrote:
> > That's my 'bivalent':
> >
> > u^:(1:`(]v))
> >
                                          
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