true.
:-false.
bird:-true.
swims:-true.
neg_flies:-ap(1).
flies:-ap(2).
ap(1):-ok(1),not flies,penguin.
ap(2):-ok(2),not neg_flies,bird.
ap(3):-ok(3),not neg_penguin,bird,swims.
ok(X):-name(X),oko(X,1),oko(X,2),oko(X,3).
penguin:-ap(3).
bl(1):-ok(1),flies.
bl(1):-ok(1),not penguin.
bl(2):-ok(2),neg_flies.
bl(2):-ok(2),not bird.
bl(3):-ok(3),neg_penguin.
bl(3):-ok(3),not bird.
bl(3):-ok(3),not swims.
prec(2,1):-true.
neg_prec(Y,X):-name(X),name(Y),prec(X,Y).
prec(X,Z):-name(X),name(Z),name(Y),prec(X,Y),prec(Y,Z).
oko(X,Y):-name(X),name(Y),not prec(X,Y).
oko(X,Y):-name(X),name(Y),prec(X,Y),ap(Y).
oko(X,Y):-name(X),name(Y),prec(X,Y),bl(Y).
false:-bird,neg_bird.
false:-swims,neg_swims.
false:-flies,neg_flies.
false:-penguin,neg_penguin.
false:-name(X),name(Y),prec(X,Y),neg_prec(X,Y).
name(3).
name(2).
name(1).