$6.[$Generalized Forwarding, $18$ pt$]$ Consider the network below that contains three subnets connected by three routers:

Specify the "match$+$action" rules at router s$3$ so that only the following network$-$wide behaviors are allowed:

$-$ Traffic from $\backslash (128\mathrm{.}119/16\backslash )$ and destined to $137\mathrm{.}220/16$ is forwarded on the direct link from s $3$ to s $1.$

$-$ Traffic from $128\mathrm{.}119/16$ and destined to $67\mathrm{.}56/16$ is forwarded on the direct link from s$3$ to s$2.$

$-$ Incoming traffic via port $2$ or $3$ and destined to $\backslash (128\mathrm{.}119/16\backslash )$ is forwarded to $128\mathrm{.}119/16$ via local port $1.$

$-$ No other forwarding should be allowed. In particular, s$3$ should not forward traffic arriving from $137\mathrm{.}220/16$ and destined for $67\mathrm{.}56/16,$ and vice versa.

Note there are $6$ match$+$action rules.