Thanks for commenting, @minismallholding I made an important effort to make it as simple as possible without leaving out anything really important. I recommend that you see chapter 19 of Book II of Avatar "the last master of the air", it is in English there explains this that I am explaining but aimed at children, it is an excellent reference. I was inspired by that chapter so that I could bring it before you. Thank you very much for commenting. I wish you good fortune and well-being.