$4\mathrm{.}13$ This exercise is intended to help you understand the relationship between forwarding, hazard detection, and ISA design. Problems in this exercise refer to the following sequence of instructions, and assume that it is executed on a $5-$stage pipelined datapath:

add $r5,r2,r1$

$1w,r3,4(r5)$

$1w,r2,0(r2)$

$orr3,r5,r3$

$swr3,0(r5)$