Suppose in the HMAC algorithm, the Message $M=$ "Hello" and the Key $K="$Hi$".$ Find out the $\text{'}S{i}_i\text{'}$ and $\text{'}{S}_0\text{'}$ based on the Hex Conversion of ASCII characters where the length of the hash code $\text{'}n\text{'}$ is $4$ bits. Also, finally convert the $\text{'}$Si$\text{'}$ and $\text{'}$So$\text{'}$ sizes in terms of the MD$5$ variant.

$\backslash$table$[[$ASCII Character,Hexadecimal,ASCII Character,Hexadecimal$],[A,41,a,61],[B,42,$b$,62],[$C$,43,$c$,63],[$D$,44,$d$,64],[E,45,e,65],[F,46,$f$,66],[,47,g,67],[H,48,h,68],[1,49,$i$,69],[J,4A,$j$,6A$