I wrote:
>   I typed  +/i.1e8  and had an answer back in less 
>   than a breath.
>
>  I am impressed.

Furthermore, I just created an array of rank  2^28   :

           a =. 1 $~ 1 #~ 2^28

           #...@$  a
        268435456

           2 ^. #...@$  a
        28

How many languages can do that?    I bet you could play a lot of fun tricks
with ranks like that.  

           secrets =. 'secret data'
        
           3 {. secret_binary =. (8#2) #: a. i. secrets
        0 1 1 1 0 0 1 1
        0 1 1 0 0 1 0 1
        0 1 1 0 0 0 1 1
        
           , secret_binary
        0 1 1 1 0 0 1 1 0 1 1 0 0 1 0 1 0 1 1 0 0 0 1 1 ...
        
           'x' $~ , secret_binary
        
           shh =. 'x' $~ , secret_binary
        
           shh   NB.  Nobody here....
        
           $  shhh
        0 1 1 1 0 0 1 1 0 1 1 0 0 1 0 1 0 1 1 0 0 0 1 1 ...
        
           a. {~ 2  #. _8 ]\ $  shhh
        secret data
           
-Dan
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