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Atoms of element A and B form an HCP lat...

Atoms of element `A` and `B` form an HCP lattice such that atoms of `A` are present at corners of the unit cell and atoms of `B` are present at the centers of both the hexagonal faces as well as inside the unit cell. All the tetrahedral voids are occupied by atoms of element `C` and all the octahedral voids are occupied by atoms of element `D`. Find out the formula of the crystalline solid.

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