AI program to solve the Monkey Banana problem

in_room(bananas).
in_room(chair).
in_room(monkey).
clever(monkey).
can_climb(monkey, chair).
tall(chair).
can_move(monkey, chair, bananas).
can_reach(X, Y):-
clever(X),close(X, Y).
get_on(X,Y):- can_climb(X,Y).
under(Y,Z):-
in_room(X),in_room(Y),in_room(Z),can_climb(X,Y,Z).
close(X,Z):-get_on(X,Y),
under(Y,Z);
tall(Y).
Output:
Queries:
?- can_reach(A, B).
A = monkey.
B = banana.
?- can_reach(monkey, banana).Yes