This repository contains a number of kidney exchange instances as used
in http://www.optimization-online.org/DB_HTML/2021/06/8432.html

These are stored in directories, where each directory corresponds to one
particular generator configuration as per the published paper.
Each directory contains 640 instances, and the configuration file used
to generate these is contained within a config.json file also within
said directory.

The format for these files is explained at
https://kep-solver.readthedocs.io/en/latest/source/formats.html#input,
and the exact configuration used to generate each set of instances
(besides size) is given in a config.json file in each directory.