lisp nconc - SERP Analysis

https://www.lispworks.com/documentation/HyperSpec/Body/f_nconc.htm

https://aiweb.cs.washington.edu/research/projects/ai2/acl62/ansicl/dictentr/nconc.htm

https://stackoverflow.com/questions/76016762/does-mapcan-really-use-nconc

http://clhs.lisp.se/Body/06_ac.htm

https://www.cs.cmu.edu/Groups/AI/html/cltl/clm/node246.html

http://www.gnu.org/s/emacs/manual/html_node/elisp/Rearrangement.html

https://www.youtube.com/watch?v=8IeSQtdHpzY

https://franz.com/support/documentation/ansicl/subsubse/exampl15.htm

https://koji-kojiro.github.io/sb-docs/build/html/common-lisp/function/NCONC.html