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If the binding energy per nucleon in ${}_3^7\mathrm{Li}$ and ${}_2^4\mathrm{He}$ nuclei are $5.60\mathrm{MeV}$ and $7.06\mathrm{MeV}$ respectively, then in the reaction $\mathrm{p}+{}_3^7\mathrm{Li}\to 2{}_2^4\mathrm{He}$ energy of proton must be