Q$4.$Consider the following system of rules and facts, where the variable $x$ stands for a patient,red$\_$spots$($x$)$ stands for patient $x$ has red spots, and so forth.

Rules:

R$1$:

R$2$:

R$3$: $IF$: cold$(x)$

THEN: contagious$(x)$

R$4$:

R$5$:

IF: $,$ measles $(x)$

THEN: contagious $(x)$

R$6$:

IF: $,$ meningitis$(x)$

THEN: contagious$(x)$

R$7$:

IF:

contagious $(x)$&

dangerous $(x)$

THEN: isolated $(x)$

R$8$:

$\backslash$table$[[$IF:$,$meningitis $(x)$