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Explicit branching rules for irreducible representations of symplectic Lie algebras sp(2N,R) in the reduction with respect to sp(2N-2,R) x sp(2,R) are deduced from the Zhelobenko-Cerkaski inequalities,allowing the classification of multiplicity free reductions and the solution to the internal labelling problem without the use of subgroup scalars.From orthogonal bases of eigenstates the matrix elements for arbitrary multiplets of sp(2N,R) are deduced.