$6.(15$ points$)$ Assume the following facts:

$($Ax$)[($Country$($x $)/\backslash ,$Democr acy$($x$))($Ez$)($Rich$($z$)/\backslash$ King$($z$,$ x$))]$

$($Au$)($Av$)($Aw$)($Ax$)[($Resides$($u$,$ x$)/\backslash$ Located$($x$,$ v$)/\backslash$ Country$($v$)/\backslash$ King$($w$,$ v$))$Rules$($w$,$ u$)]$

Country$($England$)$

Country$($SaudiArabia$)$

Country$($France$)$

Located$($London$,$England$)$

Located$($Paris$,$France$)$

Democracy$($England$)$

Democracy$($SaudiArabia$)$

Resides$($Bob$,$London$)$

Use resolution to answer the following question:

"Who rules Bob?"