$[10$ pts$]$ Route the $w,x,y$ and $z$ nets on the two tracks shown below, Use the minimum number of row$-$based tracks if possible

$($a$)$ Non$-$segmented tracks $(x$ and $y$ nets are routed below$)$

$($b$)$ Segmented tracks

$q,1$

y

$q,$ w

Nonsegmented tracks

$q,$

Intersegment switch