Skip,
I am having trouble finding perm.
I tried using A. in its place, but did not succeed.
But I think I see where you were going. Good idea.

On Mon, May 25, 2020 at 2:54 PM Skip Cave <[email protected]> wrote:

> ssmb=:+./@E.
>
> l21=.-.1 1 ssmb"1+./"2]1 2=/"1 n=.perm 4
>
> l30=.-.1 1 ssmb"1+./"2]0 3=/"1 n
>
> n#~l30*.l21
>
>
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