distance$($X$,$Y$,$D$)$:$-$ d$($X$,$Y$,$D$)$; d$($Y$,$X$,$D$).$

d$($pta$,$bfn$,455).$

d$($bfn$,$ct$,990).$

d$($bfn$,$pe$,680).$

d$($jhb$,$kby$,470).$

d$($ct$,$kby$,970).$

coastal$($ct$).$

coastal$($pe$).$

interior$($X$)$:$-$ not$($coastal$($X$)).$

collect$1($L$)$:$-$ bagof$($X$,$distance$($X$,$Y$,$D$),$L$).$

collect$2($L$)$:$-$ setof$($X$,$D$\backslash ^$distance$($X$,$Y$,$D$),$L$).$

$1.$ Give the value of L returned by the following query:

$?-$ collect$1($L$).(2)$

$2.$ Give the value of L returned by the following query:

$?-$ collect$2($L$).(2)$

$3.$ Give all the results of the following query:

$?-$ coastal$($X$),$once$($distance$($X$,$Y$,$D$)),$interior$($Y$).(3)$

$4.$ Give all the results of the following query:

$?-$ coastal$($X$),$ not$(($distance$($X$,$Y$,$D$),$coastal$($Y$))).$