https://www.sharpsightlabs.com/blog/numpy-sum/

http://labor411.org/411-blog/journalist-who-took-job-at-amazon-we-got-18-minutes-total-break-time-for-11-5-hour-shift/

https://bytes.yingw787.com/posts/2019/02/16/concurrency_with_python_hardware_based_parallelism/

https://www.csmonitor.com/Business/2019/0802/Who-s-the-boss-In-worker-owned-cooperatives-everyone-is

https://towardsdatascience.com/trees-in-data-science-dcd9830cbfcf

https://realpython.com/how-to-use-numpy-arange/

https://habr.com/en/company/mailru/blog/458688/