Thank you! now I see it more clear.

I agree with that, but. Can you answer me a thing? How do you Ron other Yaku as Honroutou or Chii toitsu (seven pairs). If you do as you say you can´t Ron that. But you can. And Honroutou will not have it´s Han reduced by 1 if no set it´s exposed but you Ron with it. If you can Ron that you always w...