Explain the following code $[6$ marks$]($deftemplate emergency $($slot type$)($slot location$))($deftemplate fire$-$squad $($slot name$)($slot location$))($deftemplate evacuated $($slot building$))($defrule all$-$fires$-$being$-$handled $($forall $($emergency $($type fire$)($location $?$where$))($fire$-$squad $($location $?$where$))($evacuated $($building $?$where$)))=>($printout t $$All buildings that are on fire $$ crlf $2$have been evacuated and$$ crlf $$have firefighters on location$$ crlf$))$