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a) $5f\rightarrow n=5,\ell=3$, hence $-3\leq m_\ell\leq 3$ b) $4d\rightarrow n=4,\ell=2$, hence $-2\leq m_\ell\leq 2$ c) $2s\rightarrow n=2,\ell=0$, hence $m_\ell= 0$
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