Updated on Mar 5, 2021
Fixed appearance frequency of some atoms
Fixed naming for some molecules (eg: O2 can now be named dioxygen AND oxygen)
Fixed naming in the same way for CH4, NH3, H2O
Fixed naming for atoms like Se and B
Moved nitrogen with covalence 3 to lvl1
Added nitrogen with covalence 2 and 4 in lvl2
Small other fixes