The total number of $\mathrm{g}_{\|}$ lines expected in the EPR spectrum of a solution of bis(salicylaldimine) copper(II) having pure ${ }^{63} \mathrm{Cu}$ and ${ }^{14} \mathrm{N}$ at 77 K is ____ (Given: 1 values of ${ }^{63} \mathrm{Cu},{ }^{14} \mathrm{N}$ and ${ }^{1} \mathrm{H}$ are $\frac{3}{2}, 1$ and $\frac{1}{2}$, respectively)
Answer
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