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The ultimate dream of unification models consists in combining both gauge andYukawa couplings into one unified coupling. This is achieved by using asupersymmetric exceptional ${\rm E}_6$ gauge symmetry together with asymptoticunification in compact five-dimensional space-time. The ultraviolet fixed pointrequires exactly three fermion generations: one in the bulk, and the two lightones localised on the ${\rm SO}(10)$ boundary in order to cancel gaugeanomalies. A second option allows to preserve baryon number and to lower thecompactification scale down to the typical scales of the intermediatePati-Salam gauge theory.

Asymptotic Ultraviolet-safe Unification of Gauge and Yukawa Couplings: The exceptional case