Björn Helgason wrote:
> 
> p: can give you many primes
> 
>     p: 5 66
> 13 331
> 

Yes, but what does one input give you? Primes or _a_ prime? And even with
your rank-1 input, the data is being taken as 0-cells, or singular inputs.
Thus, as I said originally, the input to p: is singular and the output is
singular.

Contrast that with i.

One singular input returns pluralistic output:

   i. 5
0 1 2 3 4

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