This solution feels very un-BQN-esque, but I could not get it to work by
doing arithmetic operations on an array of indices for any input but the
example one. It's still decently fact considering that we create so many
intermediate arrays at each step.
Change-Id: I883409b4d99d4954312df9b9a9ffc568c39f7726
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7602
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
