Linda, does your tree display explain the difference for you?
I have tried to show what I mean with trees. The only word that may be
missing is "isolated": Trains are isolated sequences of verbs, and
parentheses pairs can induce isolation. In the first example the first 3
stars are forced into a single chain by the rightmost parens, but in the
second example the rightmost 3 stars are not isolated from the set of 3 in
the middle, which become a continuation of the rightmost train.

   9!:2''
5
   9!:3]4

   (***(***)(***))
  ┌─ *
  ├─ *
  │   ┌─ *
──┤   │   ┌─ *
  │   ├───┼─ *
  └───┤   └─ *
      │
      │   ┌─ *
      └───┼─ *
          └─ *
   ((***)(***)***)
    ┌─ *
  ┌─┼─ *
  │ └─ *
  │
  │ ┌─ *
──┼─┼─ *
  │ └─ *
  │
  │ ┌─ *
  └─┼─ *
    └─ *



On Sat, Jul 19, 2014 at 8:49 PM, Linda Alvord <lindaalv...@verizon.net>
wrote:

> I'm still looking for the phrase or concept that explains the difference
> between these two.  Why are they producing different results?
>
>    3(***(***)(***))4
> 35831808
>
>   3((***)(***)***)4
> 429981696
>
>  If you grew up in the early years using APL, an idea might come to mind.
>
> Linda
>
>
-- 
(B=)
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