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The Yukawa couplings express the flavour problem, i.e. our inability to compute quark and lepton masses and mixing angles. […]
no significant progress has ever been made in computing quark and lepton masses and mixing angles or understanding the dynamical origin of their pattern. […] Given our failure in cracking the flavour problem, it is unlikely that its solution is simple and that it manifests itself in simple ways. Only crazy results in flavour physics have a chance to be true.
Proposed Solutions: