How is the anti-fluorite structure derived fr | vedclass

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(C) The fluorite structure $(CaF_2)$ consists of $Ca^{2+}$ ions in a face-centered cubic $(fcc)$ arrangement,with $F^-$ ions occupying all tetrahedral

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By interchanging the positions of the cations and anions in the lattice

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(C) The fluorite structure $(CaF_2)$ consists of $Ca^{2+}$ ions in a face-centered cubic $(fcc)$ arrangement,with $F^-$ ions occupying all tetrahedral voids.In the anti-fluorite structure (e.g.,$Na_2O$),the positions of the cations and anions are interchanged compared to the fluorite structure.Therefore,the anti-fluorite structure is derived by replacing the positions of cations and anions in the fluorite lattice.

How is the anti-fluorite structure derived from the fluorite structure?

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