Find the work done in the quasi$-$static processes shown below. The states are given as $($p$,$ V$)$ values for the points in the pV plane: $1(3$atm,$4$ L$),2(3$ atm, $6$ L$),3(5$ atm, $4$ L$),4(2$atm,$6L(4$ atm, $2$ L$),6(5$ atm, $5$ L$),$ and $7(2$ atm, $5$ L$).$

$($c$)$

$($e$)$

$($d$)$

$($f$)$