c$)$ The RAW $($Read$-$After$-$Write$)$ dependence refers to the situation when an operand of an instruction comes from the result of one of its previous instructions. For example

$A$:$R1=R2+4$

$B$:$R3=R1+**$

Instruction B depends on the result of instruction A because of the value in R$1.$ Identify all the RAW dependencies for the following code segment:

$11$: $R1=R2**R3$

$12$: $R2=R2+R3$

$13$: $R2=R4-R1$

$14$: $R1=R2+R1$

d$)$ Draw the timing diagram $($e$.$g$.$ like figures $14\mathrm{.}10,14\mathrm{.}11$ and $14\mathrm{.}13$ from out textbook$)$ of these $4$ instructions proceeding through the pipeline. Make sure you take account of any RAW dependencies by causing a stage to stall until it data is ready according to the description of the pipeline given at the top of this question.