Is it possible to eliminate data hazards between R$-$type instructions in this pipeline by using forwarding? Why or why not?

$10\mathrm{.}2(10$pt$)$ In the code fragments below, identify the data hazards and describe the number of pipeline stalls $($or bubbles$)$ required even with your full bypassing.

$($a$)$

mul $$4,$ $$5,$ $$6$ add $$8,$$$9,$$$4$

$($b$)$

lw $$1,8($$$2)$ add $$3,$$$1,$$$4$