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Arrange simple, body-centred and face-ce...

Arrange simple, body-centred and face-centred cubic unit cells in increasing order of their packing efficiencies.

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Packing efficiencies of simple, body-centred and face-centered cubic unit cells are 52.4%, 68% and 74% respectively.
Order: Simple `lt` body-centred `lt` face-centred.
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