>  I wrote: perhaps the raze of the result of affixing a fill element within 
> each box, as in:
>
>   <;._1  :. ([: ; ({.~ -@:>:@:#)&.>)
>   <;._2  :. ([: ; ({.~    >:@:#)&.>)

Maybe, in line with other uses of  !.  to specify fill, a new fit could be 
defined, such that:

    <;._2!.n  ^:_1   <==>   [: ; ,&n&.>

Similarly for  <;._1  .  The default  n  would be a fill element.

I'm not sure what the rules are for fits;  the phrase suggested above might 
have to be expressed as  <;._2^:_1!.n  instead (like  #^:_1!.n  is).  If that's 
the case, I'm less enthused about the idea, because it loses the original 
purpose:  to write  &.(<;._2)  concisely.  The phrase  &.(<;._2^:_1!.n^:_1)  is 
no prettier than the options I currently have.

If the fit must be applied to the inverse, I drop the proposal for it (though I 
maintain the proposal I quote above, and, more particularly, the primary 
proposal for  &.(<;.1)  in the message from which the quote is taken).

-Dan

PS:  I have a larger, more ambitious, proposal, which would elegantly handle 
this and many other cases.  I want to word it properly before I post it, but it 
will show up eventually.

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