Instructions
In a code, the $$n^{th}$$ letter of an English alphabet is coded to $$f(n)^{th}$$ letter, where $$f(n)$$ is defined by
$$\begin{cases}n + 17, & if & 1 \leq n \leq 9\\n - 1, & if & 10\leq n \leq 18 \\n -18, & if & 19 \leq n \leq 26\end{cases}$$
For decoding, the reverse process is used. Based on this coding and decoding process, answer the questions:
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