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Expansion of theta2(q^(4/3)) * (theta2(q^2)*psi(3, q^6) + theta3(q^2)*psi(6, q^6)) in q^(1/6) where psi(k, q) = Sum_{m=-infinity..infinity} q^((m+1/k)^2) and theta2 and theta3 are Jacobi theta functions [From Sloane and Teo]. - Sean A. Irvine, Sep 25 2016