Hey, I'm from Portugal, I've got a very mixed background from physics to yoga. Pretty much catching up my roots and relearning everything tech from almost 0 and trying to build as much as I can while I learn. I don't see why you wouldn't be able to triple stamp a double stamp, to say so would be denying the origin of the double stamp itself or the possibility of a quadruple stamp, which i refuse to accept as a limitation.