https://en.wikipedia.org/wiki/CNO_cycle
https://en.wikipedia.org/wiki/R-process
https://en.wikipedia.org/wiki/S-process
https://en.wikipedia.org/wiki/P-process
https://en.wikipedia.org/wiki/CNO_cycle
https://en.wikipedia.org/wiki/R-process
https://en.wikipedia.org/wiki/S-process
https://en.wikipedia.org/wiki/P-process