A system of two particles each with spin 1/2 is described by an efective Hamiltonian H = A(s12 + $2:) + Bs1 · S2, where s, and s2 are the two spins, s1z and s2z are thcir z-components, and A and B are constants. Find all the encrgy levcls of this Ilamiltonian. %3D

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