Find the lowest possible empirical formu...

Find the lowest possible empirical formular in an arrangements of unit cell where A atoms are present at corners and alternate face centers, B atoms are present at alternate edge centers and C atoms are present at half of the mid of line joining opposite face centers.
Assume: Any atom present in the inner location of the unit cell should be considered completely within the unit cell structure.

`A_(2)BC_(6)`

`A_(2)B_(3)C`

`A_(6)BC_(6)`

`A_(6)B_(3)C_(3)`

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