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Hi Yuri,
I just skimmed some of these papers. As usual, I need to review them more closely when I have enough time. On the last page, Barbieri has 6 vectors e_1 through e_6. In my models, each of these 6 vectors represents a boson (and the anti-directional vector represents that boson's anti-particle - here we must treat the photon as a superposition of B_0 and W_0, because anti-photons do not exist). These 12 states may be represented by an SO(4)xSO(4)~Spin(4). If we also include the three basis vectors (the x,y,z in which the tetrahedron exists), then we have the 15 degrees-of-freedom of an SU(4)~SO(6).
Thank you for introducing me to Lampe's papers. I assumed that Lisi's trialty (also see Raymond Aschheim's essay) was good enough to explain the origin of three generations. Lampe is worried about the "spin problem" in his Tetron model. I don't think it should be a "Tetron" - lets call it a "Penton" where the fifth component is a tachyon that introduces the origin of mass (similar to the mass ratios of Coldea et al's magnetic quasi-particles), and requires a new type of spin-statistics (as Lampe suggests, but these tachyons probably behave like anyons on an M2 Black-brane as Lawrence Crowell and I have discussed). In my opinion, Lisi's misunderstanding about this 5-fold "pentality" or "Penton" symmetry was one of the most significant errors in his E8 TOE.
Have Fun!