Consider a Feistel cipher with four rounds, where a plaintext block is denoted as P $=($Lo$,$Ro$)$ and the corresponding ciphertext block is C $=($L$4,$R$4).$ What is the corresponding ciphertext C$,$ in terms of Lo$,$ Ro$,$ and the subkeys Ki $($your points depend on it$),$ for the following round functions in a$),$ b$),$ c$),$ and d$)?$

Note$1$: What worked for me in the past is to simulate the answer is to draw a similar wire diagram as the one seen in Fig. $3\mathrm{.}2$ from your textbook. Your artistic skills will come handy here.

Note$2$: Before you start, read the following. If you noticed, writing C$=($L$4,$R$4)$ is kind of an ugly math notation here at Word. Your answer can be formatted better using Latex Math symbols. Using Latex notation for your answers in a$),$ b$),$ c$),$ and d$)$ will grant you the $2$pts in $($e$).$ Now, to start your solution, write it first using paper and pencil and later put it into Latex format $$Complete each letter section and screenshot your answer. Below shows a sample of Latex that renders the round function question in part $($a$)$ in addition to some other symbols. See the result in the picture below. You can also test examples provided in the file named latex$-$example.txt$.$