= Solution
An ordinary molecular <point group> consists of the identity, proper rotations $C_n$, and, when present, reflections $\sigma$, inversion $i$, and improper rotations $S_n$. Each operation leaves the nuclear geometry and chemical labels equivalent, so only identical nuclei can be interchanged. Translations are not elements of the <point group> of a finite isolated <molecule>. The <molecular symmetry operations> determine how electronic and vibrational coordinates transform.
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