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A. Spin waves in the parent compounds of iron-based superconductors 11 B. Neutron spin resonance and its relationship with superconductivity 14 C. The electron and hole-doping evolution of the spin excitations in the BaFe2As2 family of iron pnictides 18 D. Evolution of spin excitations in iron chalcogenides and alkali iron selenides 20 trik buy spin sweet bonanza