JVERSION
Engine: j9.5.1/j64avx2/darwin
Build: commercial/2023-12-20T04:08:21/clang-14-0-0/SLEEF=1
Library: 9.5.5
Platform: Darwin 64
Installer: j9.5 install
InstallPath: /usr/local/etc/j9.5
Contact: www.jsoftware.com

And sorting by itself along would crash JEngine

   p =. 8 2 $ 0 0 1 1 1 0 0 0 0 1 1 0 1 0 0 0
   p /: p
JE has crashed, likely due to an internal bug.  Please report the code which 
caused the crash, as well as the following printout, to the J programming forum.
....

LdBeth

>>>>> In <9d48c6be-8497-4dfd-8b17-415a135c1...@students.mimuw.edu.pl> 
>>>>>   Marcin Żołek <marcin.zo...@students.mimuw.edu.pl> wrote:

> I figured out that the problem is with sorting:
>     p =. 8 2 $ 0 0 1 1 1 0 0 0 0 1 1 0 1 0 0 0
>     p
> 0 0
> 1 1
> 1 0
> 0 0
> 0 1
> 1 0
> 1 0
> 0 0
>     /:~ p NB. returns various and wrong results
> 0 0
> 0 0
> 0 0
> 1 0
> 1 0
> 1 0
> 1 1
> 1 1

> or

> 0 0
> 0 0
> 0 0
> 1 0
> 1 0
> 1 0
> 0 0
> 0 0
>     ~.@:/:~ p NB. crashes jqt

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