Choose the missing terms out of the given alternatives. H, I, K, N, ?

The correct answer is $\boxed{\text{R}}$.

The sequence is a list of letters that are two places apart in the alphabet. The first letter is $\text{H}$, which is two places before $\text{I}$. The second letter is $\text{I}$, which is two places before $\text{K}$. The third letter is $\text{K}$, which is two places before $\text{N}$. The fourth

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