https://si.biostat.washington.edu/sites/default/files/yaysdf56.pdf
https://si.biostat.washington.edu/sites/default/files/yrdyascawa.pdf
https://si.biostat.washington.edu/sites/default/files/rfauiysf.pdf
https://si.biostat.washington.edu/sites/default/files/zxcem4.pdf
https://si.biostat.washington.edu/sites/default/files/yty6aha.pdf
https://si.biostat.washington.edu/sites/default/files/angtrua87.pdf
https://si.biostat.washington.edu/sites/default/files/halkua8.pdf
https://si.biostat.washington.edu/sites/default/files/l9ctw05.pdf
https://si.biostat.washington.edu/sites/default/files/L9btw5.pdf
https://pastebin.com/wgFXdLjc
https://ideone.com/TPfYc8