Number of paramagnetic oxides among the following given oxides is $\_\_\_\_$ $\mathrm{Li}_2 \mathrm{O}, \quad \mathrm{CaO}, \quad \mathrm{Na}_2 \mathrm{O}_2, \quad \mathrm{KO}_2$, MgO and $\mathrm{K}_2 \mathrm{O}$
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