Close, but solution requires

    Foo i: 4
0 1 2 3 4 _4 _3 _2 _1

Cheers, bob

> On Dec 12, 2018, at 8:43 AM, Don Guinn <[email protected]> wrote:
> 
> foo=:\:[:*/:~
> 
>   foo i:4
> 1 2 3 4 0 _4 _3 _2 _1

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