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None has been confirmed, and most make no prediction testable at reachable energies.","posed_since":"","precise":"For a named candidate completion of $3+1$ gravity coupled to the Standard Model (string theory, asymptotic safety, loop quantum gravity, causal dynamical triangulations, Horava gravity or another), derive a low-energy observable, at energies far below $E_P=\\sqrt{\\hbar c^5/G}$, approximately $1.2 \\times 10^{19}$ GeV ($2 \\times 10^{16}$ erg), whose predicted deviation from general relativity plus the Standard Model is computed with stated uncertainty and is within reach of current or planned measurements. 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